docs: pin actions/setup-node from v2 to v2.1.0 (#389)

Close #388

README.md

@@ -602,7 +602,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Setup Node
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v2.1.0
         with:
           node-version: '12.x'
 
@@ -646,7 +646,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Setup Node
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v2.1.0
         with:
           node-version: '12.x'
 
@@ -694,7 +694,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Setup Node
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v2.1.0
         with:
           node-version: '12.x'
 
@@ -745,7 +745,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Setup Node
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v2.1.0
         with:
           node-version: '12.x'
 
@@ -797,7 +797,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Setup Node
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v2.1.0
         with:
           node-version: '12.x'
 
@@ -979,7 +979,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Setup Node
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v2.1.0
         with:
           node-version: '12.x'