Replace inappropriate character in install docs

A "right single quotation mark" (U+2019) somehow ended up being used as an apostrophe in the installation instructions.

Author: per1234

docs/installation.md

@@ -83,5 +83,5 @@ Checksums for the nightly builds are available at
 
 ### Build from source
 
-If you’re familiar with Golang or if you want to contribute to the project, you will probably build Arduino Lint locally
+If you're familiar with Golang or if you want to contribute to the project, you will probably build Arduino Lint locally
 with your Go toolchain. See the ["How to contribute"](CONTRIBUTING.md#building-the-source-code) page for instructions.