unspecified - grammar fix

docs/BUILDING.md

@@ -45,7 +45,7 @@ $ python -m PyInstaller Bane-Of-Wargs.spec
 # create a single executable name `Bane Of Wargs` with all the source code in it, the required libraries and additional stuff required
 ```
 
-Alternatively, you can run the bash script `compile.sh` in the root directory **but you're still need the `yamale/VERSION` with `4.0.4` written in for the first time**.
+Alternatively, you can run the bash script `compile.sh` in the root directory **but you'll still need the `yamale/VERSION` with `4.0.4` written in for the first time**.
 **For windows and macos user, compiling has not been tested yet.**
 
 The compiled executable file will be found in the `dist/` directory, which is located in the root directory.