Fix compare links in CHANGELOG.md (#375)

Co-authored-by: Tigran Najaryan <4194920+tigrannajaryan@users.noreply.github.com>

CHANGELOG.md

@@ -22,7 +22,7 @@ Full list of differences found in [this compare](https://github.com/open-telemet
 
 ## 0.15.0 - 2022-03-19
 
-Full list of differences found in [this compare](https://github.com/open-telemetry/opentelemetry-proto/compare/v0.15.0...v0.14.0).
+Full list of differences found in [this compare](https://github.com/open-telemetry/opentelemetry-proto/compare/v0.14.0...v0.15.0).
 
 ### Changed
 
@@ -34,15 +34,15 @@ Full list of differences found in [this compare](https://github.com/open-telemet
 
 ## 0.14.0 - 2022-03-08
 
-Full list of differences found in [this compare](https://github.com/open-telemetry/opentelemetry-proto/compare/v0.14.0...v0.13.0).
+Full list of differences found in [this compare](https://github.com/open-telemetry/opentelemetry-proto/compare/v0.13.0...v0.14.0).
 
 ### Removed
 
 * Deprecate LogRecord.Name field (#357)
 
 ## 0.13.0 - 2022-02-10
 
-Full list of differences found in [this compare](https://github.com/open-telemetry/opentelemetry-proto/compare/v0.13.0...v0.12.0).
+Full list of differences found in [this compare](https://github.com/open-telemetry/opentelemetry-proto/compare/v0.12.0...v0.13.0).
 
 ### Changed
 
@@ -62,7 +62,7 @@ Full list of differences found in [this compare](https://github.com/open-telemet
 
 ## 0.12.0 - 2022-01-19
 
-Full list of differences found in [this compare](https://github.com/open-telemetry/opentelemetry-proto/compare/v0.12.0...v0.11.0).
+Full list of differences found in [this compare](https://github.com/open-telemetry/opentelemetry-proto/compare/v0.11.0...v0.12.0).
 
 ### Changed