Create a changelog to document changes between versions (#114)

* Create a changelog to document changes between versions

fixes #113

* fixup! Create a changelog to document changes between versions

* Apply suggestions from code review

Standardize on complete sentences with `.`

Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>

* Move internal/trace/http.go REMOVED to CHANGES

Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>

CHANGELOG.md

@@ -0,0 +1,66 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Changed
+
+- Update `CONTRIBUTING.md` to ask for updates to `CHANGELOG.md` with each pull request. (#114)
+- Create this `CHANGELOG.md`. (#114)
+
+## [0.7.0] - 2020-06-29
+
+This release upgrades its [go.opentelemetry.io/otel](https://github.com/open-telemetry/opentelemetry-go "Open Telemetry for Go on Github") dependency to v0.7.0.
+
+### Added
+
+- Create `RELEASING.md` instructions. (#101)
+- Apply transitive dependabot go.mod updates as part of a new automatic Github workflow. (#94)
+- New dependabot integration to automate package upgrades. (#61)
+- Add automatic tag generation script for release. (#60)
+
+### Changed
+
+- Upgrade Datadog metrics exporter to include Resource tags. (#46)
+- Added output validation to Datadog example. (#96)
+- Move Macaron package to match layout guidelines. (#92)
+- Update top-level README and instrumentation README. (#92)
+- Bump google.golang.org/grpc from 1.29.1 to 1.30.0. (#99)
+- Bump github.com/golangci/golangci-lint from 1.21.0 to 1.27.0 in /tools. (#77)
+- Bump go.mongodb.org/mongo-driver from 1.3.2 to 1.3.4 in /instrumentation/go.mongodb.org/mongo-driver. (#76)
+- Bump github.com/stretchr/testify from 1.5.1 to 1.6.1. (#74)
+- Bump gopkg.in/macaron.v1 from 1.3.5 to 1.3.9 in /instrumentation/macaron. (#68)
+- Bump github.com/gin-gonic/gin from 1.6.2 to 1.6.3 in /instrumentation/gin-gonic/gin. (#73)
+- Bump github.com/DataDog/datadog-go from 3.5.0+incompatible to 3.7.2+incompatible in /exporters/metric/datadog. (#78)
+- Replaced `internal/trace/http.go` helpers with `api/standard` helpers from otel-go repo. (#112)
+
+## [0.6.1] - 2020-06-08
+
+First official tagged release of `contrib` repository.
+
+### Added
+
+- `labstack/echo` trace instrumentation (#42)
+- `mongodb` trace instrumentation (#26)
+- Go Runtime metrics (#9)
+- `gorilla/mux` trace instrumentation (#19)
+- `gin-gonic` trace instrumentation (#15)
+- `macaron` trace instrumentation (#20)
+- `dogstatsd` metrics exporter (#10)
+- `datadog` metrics exporter (#22)
+- Tags to all modules in repository
+- Repository folder structure and automated build (#3)
+
+### Changes
+
+- Prefix support for dogstatsd (#34)
+- Update Go Runtime package to use batch observer (#44)
+
+[Unreleased]: https://github.com/open-telemetry/opentelemetry-go-contrib/compare/v0.7.0...HEAD
+[0.7.0]: https://github.com/open-telemetry/opentelemetry-go-contrib/releases/tag/v0.7.0
+[0.6.1]: https://github.com/open-telemetry/opentelemetry-go-contrib/releases/tag/v0.6.1

CONTRIBUTING.md

@@ -35,7 +35,7 @@ To create a new PR, fork the project in GitHub and clone the upstream
 repo:
 
 ```sh
-$ git clone https://github.com/open-telemetry/opentelemetry-go
+$ git clone https://github.com/open-telemetry/opentelemetry-go-contrib
 ```
 This would put the project in the `opentelemetry-go-contrib` directory in
 current working directory.
@@ -46,19 +46,21 @@ Enter the newly created directory and add your fork as a new remote:
 $ git remote add <YOUR_FORK> git@github.com:<YOUR_GITHUB_USERNAME>/opentelemetry-go
 ```
 
-Check out a new branch, make modifications, run linters and tests, and
-push the branch to your fork:
+Check out a new branch, make modifications, run linters and tests, update
+`CHANGELOG.md` and push the branch to your fork:
 
 ```sh
 $ git checkout -b <YOUR_BRANCH_NAME>
 # edit files
+# update changelog
 $ make precommit
 $ git add -p
 $ git commit
 $ git push <YOUR_FORK> <YOUR_BRANCH_NAME>
 ```
 
-Open a pull request against the main `opentelemetry-go-contrib` repo.
+Open a pull request against the main `opentelemetry-go-contrib` repo. Be sure to add the pull
+request ID to the entry you added to `CHANGELOG.md`.
 
 ### How to Receive Comments
 
@@ -71,18 +73,19 @@ Open a pull request against the main `opentelemetry-go-contrib` repo.
 
 A PR is considered to be **ready to merge** when:
 
-* It has received two approvals from Collaborators/Maintainers (at
+* It has received two approvals from Approvers/Maintainers (at
   different companies).
-* Major feedbacks are resolved.
+* Major feedback items are resolved.
 * It has been open for review for at least one working day. This gives
   people reasonable time to review.
 * Trivial change (typo, cosmetic, doc, etc.) doesn't have to wait for
   one day.
+* `CHANGELOG.md` has been updated to reflect what has been
+  added, changed, removed, or fixed.
 * Urgent fix can take exception as long as it has been actively
   communicated.
 
-Any Collaborator/Maintainer can merge the PR once it is **ready to
-merge**.
+Any Maintainer can merge the PR once it is **ready to merge**.
 
 ## Style Guide