message: Small readme tweaks
diff: @@ -45,19 +45,16 @@ Building cquery is simple. The external dependencies are few:
  $ clang --version # if missing, sudo apt-get install clang
  $ git clone https://github.com/jacobdufault/cquery --recursive
  $ cd cquery
  -$ ./waf configure --prefix ~/.local/stow/cquery
  -$ ./waf build
  -# -g -O3, built build/release/bin/cquery
  -$ ./waf install
  -# optional, copies the executable to $PREFIX/bin/cquery
  +$ ./waf configure --prefix ~/.local/stow/cquery # --prefix is optional, it specifies install directory
  +$ ./waf build # -g -O3, built build/release/bin/cquery
  +$ ./waf install # optional, copies the executable to $PREFIX/bin/cquery
  ```
  For a debug build:
  ```bash
  $ ./waf configure --variant=debug
  -$ ./waf build --variant=debug
  -# -g -O0, built build/debug/bin/cquery
  +$ ./waf build --variant=debug # -g -O0, built build/debug/bin/cquery
  ```
  ## Install extension
  