Add solidity linting and Travis

.eslintrc.js

@@ -2,10 +2,8 @@ module.exports = {
   env: {
     mocha: true,
   },
-  extends: ["airbnb", "plugin:prettier/recommended"],
   plugins: ["babel"],
   rules: {
-    "prettier/prettier": ["error"],
     "import/extensions": [
       "error",
       "ignorePackages",

.soliumrc.json

@@ -0,0 +1,9 @@
+{
+  "extends": "solium:all",
+  "rules": {
+    "indentation": ["error", 4],
+    "quotes": ["error", "double"],
+    "arg-overflow": "off",
+    "blank-lines": "off"
+  }
+}

.travis.yml

@@ -0,0 +1,27 @@
+sudo: required
+
+dist: trusty
+
+language: node_js
+
+node_js:
+  - '10'
+install:
+  - npm install -g truffle
+  - npm install -g ganache-cli
+  - npm install
+env:
+  - TASK=test
+  - TASK=lint
+matrix:
+  fast_finish: true
+  allow_failures:
+    - env: TASK=lint
+before_script:
+  - ganache-cli > /dev/null &
+  - sleep 5
+script:
+  - npm run $TASK
+
+notifications:
+  email: false