docs(README): fix path of contribution and typo (#1451)

* docs(README): fix path of contribution

* docs(README): fix typo

Author: guzhongren

.github/CONTRIBUTING.md

@@ -12,7 +12,7 @@ Hi! It's really really exciting that you are interested in contributing to mapta
 
 - Submit your PRs against the `master` branch.
 
-- **DO NOT** checkin `dist` in the commits.
+- **DO NOT** check in `dist` in the commits.
 
 - Make sure `npm test` passes. (see [development setup](#development-setup))
 
@@ -81,7 +81,7 @@ maptalks's unit tests are run in the following CI servers:
 
 Common causes of CI failures:
 * If your PR failes in one or two CI tests but succeeds in the others, it usually indicated a browser compatible problem. 
-* If testing fails due to "timeout of 2000ms exceeded" errors in serverl cases which was passed in the previous testings, it's possible caused by server glitches and you can try to push more commits to trigger a re-testing.
+* If testing fails due to "timeout of 2000ms exceeded" errors in several cases which was passed in the previous testings, it's possible caused by server glitches and you can try to push more commits to trigger a re-testing.
 * Only failure of appveor may be caused by ES6 codes in unit tests, tests must be written in **ES5** as IE doesn't support ES2015 grammar.
 
 ## Project Structure
@@ -102,4 +102,4 @@ Common causes of CI failures:
 
 - **`src`**: contains the source code, obviously. The codebase is written in ES2015.
 
-- **`test`**: contains all tests written in **ES5**(for compatibility of IE). The unit tests are written with [Mocha](https://mochajs.org), [expect.js](https://github.com/Automattic/expect.js) for assertion, [happen](https://github.com/tmcw/happen) for event mocking and run with [Karma](http://karma-runner.github.io/0.13/index.html). 
+- **`test`**: contains all tests written in **ES5**(for compatibility of IE). The unit tests are written with [Mocha](https://mochajs.org), [expect.js](https://github.com/Automattic/expect.js) for assertion, [happen](https://github.com/tmcw/happen) for event mocking and run with [Karma](http://karma-runner.github.io/0.13/index.html).

README.md

@@ -73,7 +73,7 @@ It's easy and joyful to write plugins for maptalks, please check out [the tutori
 We warmly welcome any kind of contributions including issue reportings, pull requests, documentation corrections, feature requests and any other helps.
 
 ### Contributing Guide
-Please read our [contributing guide](CONTRIBUTING.md) to learn about our development process, how to propose fixes and improvements, and how to test your changes to maptalks.
+Please read our [contributing guide](.github/CONTRIBUTING.md) to learn about our development process, how to propose fixes and improvements, and how to test your changes to maptalks.
 
 ## Acknowledgments