docs: bump actions/setup-node from v1 to v2

Author: peaceiris

README.md

@@ -546,7 +546,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Setup Node
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v2
         with:
           node-version: '12.x'
 
@@ -590,7 +590,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Setup Node
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v2
         with:
           node-version: '12.x'
 
@@ -638,7 +638,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Setup Node
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v2
         with:
           node-version: '12.x'
 
@@ -689,7 +689,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Setup Node
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v2
         with:
           node-version: '12.x'
 
@@ -741,7 +741,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Setup Node
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v2
         with:
           node-version: '12.x'
 
@@ -923,7 +923,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Setup Node
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v2
         with:
           node-version: '12.x'