Repo standardization (#50)

* Enforcing minimum node version 12 via .nvmrc, circleci, and package file
* Adding basic .gitattributes file
* Adding entry about running tests to the readme

.circleci/config.yml

@@ -5,7 +5,7 @@ executors:
     parameters:
         node_version:
           type: integer
-          default: 10
+          default: 12
     docker:
       - image: circleci/node:<< parameters.node_version >>
 
@@ -16,14 +16,14 @@ workflows:
           name: prep-deps-<< matrix.node_version >>
           matrix:
             parameters:
-              node_version: [10, 12, 14]
+              node_version: [12, 14]
       - test-lint:
           requires:
-            - prep-deps-10
+            - prep-deps-12
       - test-unit:
           matrix:
             parameters:
-              node_version: [10, 12, 14]
+              node_version: [12, 14]
           requires:
             - prep-deps-<< matrix.node_version >>
       - all-tests-pass:

.gitattributes

@@ -0,0 +1,3 @@
+* text=auto
+
+yarn.lock linguist-generated=false

.nvmrc

@@ -1 +1 @@
-v10
+v12

README.md

@@ -25,6 +25,12 @@ cleanup:
 filterMiddleware.destroy()
 ```
 
+## Running Tests
+
+```bash
+yarn test
+```
+
 ### Changelog
 
 ##### 2.0

package.json

@@ -3,6 +3,9 @@
   "version": "4.2.2",
   "description": "[json-rpc-engine](https://github.com/MetaMask/json-rpc-engine) middleware implementing ethereum filter methods. Backed by an [eth-block-tracker](https://github.com/MetaMask/eth-block-tracker) and web3 provider interface (`web3.currentProvider`).",
   "main": "index.js",
+  "engines": {
+    "node": ">=12.0.0"
+  },
   "scripts": {
     "lint": "printf '%s\\n' 'No lint command'",
     "test": "node test"