fix: support editorconfig (#20)

Author: azz

README.md

@@ -94,4 +94,4 @@ For example `pretty-quick --since HEAD` will format only staged files.
 
 ## Configuration and Ignore Files
 
-`pretty-quick` will respect your [`.prettierrc`](https://prettier.io/docs/en/configuration) and [`.prettierignore`](https://prettier.io/docs/en/ignore#ignoring-files) files, so there's no additional setup required. Configuration files will be found by searching up the file system. `.prettierignore` files are only found from the working directory that the command was executed from.
+`pretty-quick` will respect your [`.prettierrc`](https://prettier.io/docs/en/configuration), [`.prettierignore`](https://prettier.io/docs/en/ignore#ignoring-files), and [`.editorconfig`](http://editorconfig.org/) files, so there's no additional setup required. Configuration files will be found by searching up the file system. `.prettierignore` files are only found from the working directory that the command was executed from.

src/formatFiles.js

@@ -5,7 +5,7 @@ import { join } from 'path';
 export default (directory, files, { config, onWriteFile } = {}) => {
   for (const relative of files) {
     const file = join(directory, relative);
-    const options = resolveConfig.sync(file, { config });
+    const options = resolveConfig.sync(file, { config, editorconfig: true });
     const input = readFileSync(file, 'utf8');
     const output = format(
       input,