Fix CodingStyle link (#1473)

.github/contribute.md

@@ -9,7 +9,7 @@ Second. Let's try to keep it homogeneous and readable. I have my coding style. I
 * **Only touch relevant files** (beware if your editor has auto-formatting feature enabled)
 * If you are adding a new functionality (new hardware, new library support) not related to an existing component move it to it's **own modules** (.ino file)
 * If you are adding new library, include it in one of the **sample travis profiles**, so our integrated CI will try to compile it.
-* Make sure you check [Coding Style](CodingStyle)
+* Make sure you check [Coding Style](https://github.com/xoseperez/espurna/wiki/CodingStyle)
 * PRs that don't compile (break Travis) or cause more coding errors (as reported by Codacy) will not be merged. Please fix the issue. Same goes for PRs that are raised against older commit in dev - you might need to rebase and resolve conflicts.