Change from avr-gcc@7 to @8 for Mac

docs/faq_build.md

@@ -140,8 +140,8 @@ For now, you need to rollback avr-gcc to 7 in brew.
 
 ```
 brew uninstall --force avr-gcc
-brew install avr-gcc@7
-brew link --force avr-gcc@7
+brew install avr-gcc@8
+brew link --force avr-gcc@8
 ```
 
 ### I just flashed my keyboard and it does nothing/keypresses don't register - it's also ARM (rev6 planck, clueboard 60, hs60v2, etc...) (Feb 2019)

docs/getting_started_build_tools.md

@@ -62,14 +62,14 @@ If you're using [homebrew,](http://brew.sh/) you can use the following commands:
     brew tap osx-cross/avr
     brew tap PX4/homebrew-px4
     brew update
-    brew install avr-gcc@7
-    brew link --force avr-gcc@7
+    brew install avr-gcc@8
+    brew link --force avr-gcc@8
     brew install dfu-programmer
     brew install dfu-util
     brew install gcc-arm-none-eabi
     brew install avrdude
 
-This is the recommended method. If you don't have homebrew, [install it!](http://brew.sh/) It's very much worth it for anyone who works in the command line. Note that the `make` and `make install` portion during the homebrew installation of `avr-gcc@7` can take over 20 minutes and exhibit high CPU usage.
+This is the recommended method. If you don't have homebrew, [install it!](http://brew.sh/) It's very much worth it for anyone who works in the command line. Note that the `make` and `make install` portion during the homebrew installation of `avr-gcc@8` can take over 20 minutes and exhibit high CPU usage.
 
 ## Windows with msys2 (recommended)
 

docs/zh-cn/faq_build.md

@@ -137,8 +137,8 @@ brew install avrdude
 
 ```
 brew uninstall --force avr-gcc
-brew install avr-gcc@7
-brew link --force avr-gcc@7
+brew install avr-gcc@8
+brew link --force avr-gcc@8
 ```
 
 ### 我刷新了我的键盘但是键盘不工作/按键没有注册 - 而且还是ARM的 (rev6 planck, clueboard 60, hs60v2, etc...) (Feb 2019)

util/macos_install.sh

@@ -22,5 +22,5 @@ fi
 brew tap osx-cross/avr
 brew tap PX4/homebrew-px4
 brew update
-brew install avr-gcc@7 gcc-arm-none-eabi dfu-programmer avrdude dfu-util python3
-brew link --force avr-gcc@7
+brew install avr-gcc@8 gcc-arm-none-eabi dfu-programmer avrdude dfu-util python3
+brew link --force avr-gcc@8