Updated Windows installation instructions

INSTALL

@@ -50,6 +50,7 @@ Install the runtime dependencies:
  * python-twisted-core
  * python-sipsimple (>= 3.0.0)
  * python-zope.interface
+ * google-api-python-client
 
 After installing the above dependencies, install Blink system wide using:
 
@@ -90,10 +91,11 @@ Installation on Microsoft Windows
 Step 1. Install dependencies
 ----------------------------
 
-* Install PyQt4: pacman -S mingw-w64-i686-python2-pyqt5
+* Install PyQt5:
+  pacman -S mingw-w64-i686-python2-pyqt5
 
-NOTE: at the time of this writing binary packages weren't available due to some work
-in progress, they can alternatively be built manually.
+* Install Google API client
+  pip install google-api-python-client
 
 
 Step 1.1. Install libvncclient
@@ -103,9 +105,12 @@ The MSYS2 project does not provide a package for libvncclient, and since our
 needs are pretty specific, we provide the source to build a package which just
 install the client side VNC libraries.
 
-* Install dependencies: patch
-* Get the package code: darcs get http://devel.ag-projects.com/repositories/windows/mingw-w64-libvncclient
-* Enter the directory and build+instal the package: cd mingw-w64-libvncclient && makepkg-mingw -cifL --nocheck --nosign
+* Install dependencies:
+  pacman -S patch
+* Get the package code:
+  darcs get http://devel.ag-projects.com/repositories/windows/mingw-w64-libvncclient
+* Enter the directory and build+instal the package:
+  cd mingw-w64-libvncclient && makepkg-mingw -cifL --nocheck --nosign
 * In case the above command fails with an error run it again