fix pyusb install instructions

keyboards/exclusive/e6v2/bmc/readme.md

@@ -34,9 +34,9 @@ macOS:
     ```
 3. Install the following packages:
     ```
-    brew install python
+    brew install python3
     pip3 install pyusb
-    brew install --HEAD`https://raw.githubusercontent.com/robertgzr/homebrew-tap/master/bootloadhid.rb
+    brew install --HEAD https://raw.githubusercontent.com/robertgzr/homebrew-tap/master/bootloadhid.rb
 
 4. Place your keyboard into reset. 
 5. Flash the board by typing `bootloadHID -r` followed by the path to your `.hex` file.