ci(travis): change matrix to be jobs

The matrix root key is actually an alias for the jobs root key. Because of this, the matrix key is
overriding the jobs key and prevents new releases to be created.

.travis.yml

@@ -6,8 +6,6 @@ language: node_js
 node_js:
   - v10
   - v12
-matrix:
-  fast_finish: true
 
 branches:
   # Blacklist
@@ -28,6 +26,7 @@ notifications:
     secure: "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"
 
 jobs:
+  fast_finish: true
   include:
     - stage: release
       if: branch = master