Build on Go 1.15, fix up version in matrix tests

Author: jmoeser

.github/workflows/go-test.yaml

@@ -27,7 +27,7 @@ jobs:
  - name: Setup Go
  uses: actions/setup-go@v2
  with:
- go-version: '1.14.0'
+ go-version: ${{ matrix.go }}
 
  - name: Run build
  run: go build .

.github/workflows/release.yml

@@ -17,7 +17,7 @@ jobs:
  - name: Setup Go
  uses: actions/setup-go@v2
  with:
- go-version: '1.14.0'
+ go-version: '1.15.0'
 
  - name: Run build
  run: go build .