update to use node 12.x (#37)

Update to use node 12.x

- extra:
  * fix allocation strategy case exchange rate numbers due to upgrade of ganache

.github/workflows/ci.yaml → .github/workflows/cd.yaml

@@ -1,4 +1,4 @@
-name: CI
+name: CD
 
 on:
   push:
@@ -41,10 +41,10 @@ jobs:
 
     - uses: actions/checkout@v1
 
-    - name: Use Node.js 10.x
+    - name: Use Node.js 12.x
       uses: actions/setup-node@v1
       with:
-        node-version: 10.x
+        node-version: 12.x
 
     - name: npm install, build, and test
       run: |

README.md

@@ -2,7 +2,7 @@
 
 <p align="center">
     <a href="https://github.com/rtoken-project/rtoken-contracts/actions">
-        <img alt="GitHub Workflow Status" src="https://img.shields.io/github/workflow/status/rtoken-project/rtoken-contracts/Node CI">
+        <img alt="GitHub Workflow Status" src="https://img.shields.io/github/workflow/status/rtoken-project/rtoken-contracts/CD">
     </a>
     <a href="https://coveralls.io/github/rtoken-project/rtoken-contracts">
         <img alt="Coveralls github branch" src="https://img.shields.io/coveralls/github/rtoken-project/rtoken-contracts/master">