Remove yarn (#128)

Author: sasalx

.editorconfig

@@ -15,6 +15,6 @@ indent_size = 4
 [Makefile]
 indent_style = tab
 
-[{package.json,package-lock.json,yarn.lock,.travis.yml}]
+[{package.json,package-lock.json,.travis.yml}]
 indent_style = space
 indent_size = 4

.prettierignore

@@ -1,6 +1,5 @@
 package.json
 package-lock.json
-yarn.lock
 *.snap
 *.bundle.js
 *.bundle.js.map

README.md

@@ -33,7 +33,6 @@ Full documentation [here](https://danielcaldas.github.io/react-d3-graph/docs/ind
 
 ```bash
 npm install react-d3-graph // using npm
-yarn add react-d3-graph // using yarn
 ```
 
 ## Usage sample