roll back CICD node versioning

.github/workflows/build.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
       - uses: actions/setup-node@v1
         with:
-          node-version: 16
+          node-version: 12
 
       - uses: actions/checkout@v2
 
@@ -34,7 +34,7 @@ jobs:
     steps:
       - uses: actions/setup-node@v1
         with:
-          node-version: 16
+          node-version: 12
 
       - uses: actions/checkout@v2
 

.github/workflows/codecov.yml

@@ -14,7 +14,7 @@ jobs:
       - name: Generate coverage report
         uses: actions/setup-node@v1
         with:
-          node-version: '16'
+          node-version: '12'
       - run: npm install
       - run: npm run run-coverage
       - run: npm run generate-report

.github/workflows/publish.yaml

@@ -15,7 +15,7 @@ jobs:
     steps:
       - uses: actions/setup-node@v1
         with:
-          node-version: 16
+          node-version: 12
 
       - uses: actions/checkout@v2
       - name: Build

.github/workflows/test.yml

@@ -8,21 +8,21 @@ on:
 
 jobs:
   unit:
-    name: Unit Test (Node.js v16)
+    name: Unit Test (Node.js v${{ matrix.node }})
     runs-on: ubuntu-latest
     steps:
       - uses: actions/setup-node@v1
         with:
-          node-version: 16
+          node-version: ${{ matrix.node }}
 
       - uses: actions/checkout@v2
 
       - uses: actions/cache@v2
         id: cache-deps
         with:
           path: node_modules
-          key: ${{ runner.os }}-node16-${{ hashFiles('**/package-lock.json') }}
-
+          key: ${{ runner.os }}-node${{ matrix.code }}-${{ hashFiles('**/package-lock.json') }}
+                
       - name: Run test
         run: |
           npm install

.github/workflows/test_e2e.yml

@@ -85,7 +85,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v1
         with:
-          node-version: 16
+          node-version: 14
 
       - uses: actions/cache@v2
         id: cache-deps

.github/workflows/test_e2e_IBC.yml

@@ -226,7 +226,7 @@ jobs:
             - name: Setup Node.js
               uses: actions/setup-node@v1
               with:
-                node-version: 16
+                node-version: 14
 
             - uses: actions/cache@v2
               id: cache-deps

.github/workflows/upload.yaml

@@ -12,7 +12,7 @@ jobs:
     steps:
       - uses: actions/setup-node@v1
         with:
-          node-version: 16
+          node-version: 12
 
       - uses: actions/checkout@v2
       - name: build lib