yarn => npm 5

.editorconfig

@@ -7,4 +7,3 @@ indent_size = 2
 end_of_line = lf
 trim_trailing_whitespace = true
 insert_final_newline = true
-

.travis.yml

@@ -2,4 +2,4 @@ language: node_js
 node_js:
   - "6.9"
 
-script: yarn test
+script: npm test

README.md

@@ -8,7 +8,7 @@ A dark blue theme for [themer](https://github.com/mjswensen/themer), with colors
 
 Install this module wherever you have `themer` installed:
 
-    yarn add themer-colors-night-sky
+    npm install themer-colors-night-sky
 
 Then pass `themer-colors-night-sky` as a `-c` (`--colors`) arg to `themer`:
 

package.json

@@ -10,9 +10,9 @@
   },
   "scripts": {
     "build": "eslint src && babel --out-dir lib src",
-    "start": "watch 'yarn run build' src",
-    "prepublish": "yarn run build",
-    "test": "yarn run build && jest"
+    "start": "watch 'npm run build' src",
+    "prepare": "npm run build",
+    "test": "npm run build && jest"
   },
   "devDependencies": {
     "babel-cli": "^6.18.0",