Upgrade Node to v14.11

Changes:

- `package.json` field `engines.node` - updated, previously: `>=8.11.0`
- `.nvmrc` - created
- `.circleci/config.yml` Docker image for `container_config_node` - Docker updated, previously: `circleci/node:8-browsers`

Author: andygout

.circleci/config.yml

@@ -3,15 +3,15 @@
 
 references:
 
-  container_config_node8: &container_config_node8
+  container_config_node14: &container_config_node14
     working_directory: ~/project/build
     docker:
-      - image: circleci/node:8-browsers
+      - image: circleci/node:14-browsers
 
-  container_config_lambda_node8: &container_config_lambda_node8
+  container_config_lambda_node14: &container_config_lambda_node14
     working_directory: ~/project/build
     docker:
-      - image: lambci/lambda:build-nodejs8.10
+      - image: lambci/lambda:build-nodejs14.x
 
   workspace_root: &workspace_root
     ~/project
@@ -60,7 +60,7 @@ version: 2
 jobs:
 
   build:
-    <<: *container_config_node8
+    <<: *container_config_node14
     steps:
       - checkout
       - run:
@@ -90,7 +90,7 @@ jobs:
             - build
 
   test:
-    <<: *container_config_node8
+    <<: *container_config_node14
     steps:
       - *attach_workspace
       - run:
@@ -106,7 +106,7 @@ jobs:
           destination: test-results
 
   publish:
-    <<: *container_config_node8
+    <<: *container_config_node14
     steps:
       - *attach_workspace
       - run:

.nvmrc

@@ -0,0 +1 @@
+14.11

package.json

@@ -31,6 +31,6 @@
     "standard": "^12.0.1"
   },
   "engines": {
-    "node": ">=8.11.0"
+    "node": "14.x"
   }
 }