enable cache for build, closes #8 (#12)

* enable cache for build, closes #8
* goimports
* lint fixes

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

.github/workflows/pr.yml

@@ -11,9 +11,15 @@ jobs:
     - name: setup
       uses: actions/setup-go@v1
       with:
-        go-version: 1.14
+        go-version: 1.15
     - name: checkout
       uses: actions/checkout@v2
+    - name: cache
+      uses: actions/cache@v2
+      with:
+        path: ~/go/pkg/mod
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: ${{ runner.os }}-go-
     - name: deps
       run: go get -v -t -d ./...
     - name: test

.github/workflows/push.yml

@@ -11,9 +11,15 @@ jobs:
     - name: setup
       uses: actions/setup-go@v1
       with:
-        go-version: 1.14
+        go-version: 1.15
     - name: checkout
       uses: actions/checkout@v2
+    - name: cache
+      uses: actions/cache@v2
+      with:
+        path: ~/go/pkg/mod
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: ${{ runner.os }}-go-
     - name: deps
       run: go get -v -t -d ./...
     - name: test