Remove ignored file and set up license-eye (#1)

diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 698d271..915e00e 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -38,6 +38,11 @@
       - name: Check out code into the Go module directory
         uses: actions/checkout@v2
 
+      - name: Check License
+        uses: apache/skywalking-eyes@d7cc2d55e706869d52400f6bac146977439b2744
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
       - name: Lint Codes
         run: make lint
 
@@ -45,4 +50,4 @@
         run: make test
 
       - name: Build
-        run: make build
\ No newline at end of file
+        run: make build
diff --git a/coverage.txt b/coverage.txt
deleted file mode 100644
index 79b28a0..0000000
--- a/coverage.txt
+++ /dev/null
@@ -1 +0,0 @@
-mode: atomic