fix input parameter requirements (#10)

* fix input parameter requirements
* simplify go test invocation

Co-authored-by: Septs <github@septs.pw>

README.md

@@ -22,7 +22,7 @@ uses [gcov2lcov](https://github.com/jandelgado/gcov2lcov) under the hood.
 
 ### `working-directory`
 
-**Optional** Name of the change to specific working-directory.
+**Optional** Name of directory where gcov2lcov is run. Defaults to `$GITHUB_WORKSPACE`.
 
 ## Outputs
 
@@ -47,18 +47,15 @@ coverage:
   steps:
     - name: Install Go
       if: success()
-      uses: actions/setup-go@v2-beta
+      uses: actions/setup-go@v2
+      with:
+        go-version: 1.15.x
     - name: Checkout code
       uses: actions/checkout@v2
     - name: Calc coverage
-      run: |
-        export PATH=$PATH:$(go env GOPATH)/bin
-        go test -v -covermode=count -coverprofile=coverage.out
+      run: go test -v -covermode=count -coverprofile=coverage.out
     - name: Convert coverage to lcov
       uses: jandelgado/gcov2lcov-action@v1.0.5
-      with:
-        infile: coverage.out
-        outfile: coverage.lcov
     - name: Coveralls
       uses: coverallsapp/github-action@v1.0.4
       with:

action.yml

@@ -5,15 +5,15 @@ description: "convert golang coverage to lcov format"
 inputs:
   infile:
     description: "go coverage input file"
-    required: true
+    required: false
     default: coverage.out
   outfile:
     description: "lcov output file"
-    required: true
+    required: false
     default: coverage.lcov
   version:
     description: "gcov2lcov version"
-    required: true
+    required: false
     default: latest
   working-directory:
     description: "change working directory"