Fixed incorrect hint default.

The default for the GLFW_ALPHA_BITS hint was zero instead of 8.

README.md

@@ -100,6 +100,7 @@ See the [GLFW 3.0 documentation](http://www.glfw.org/docs/3.0/).
 ## Changelog
 
  - Bugfix: The `-Wall` flag was not used with Clang and other GCC compatibles
+ - Bugfix: The default for `GLFW_ALPHA_BITS` was set to zero
 
 
 ## Contact
@@ -184,6 +185,7 @@ skills.
  - Bradley Smith
  - Julian Squires
  - Johannes Stein
+ - Justin Stoecker
  - Nathan Sweet
  - TTK-Bandit
  - Sergey Tikhomirov

src/window.c

@@ -284,6 +284,7 @@ void glfwDefaultWindowHints(void)
     _glfw.hints.redBits     = 8;
     _glfw.hints.greenBits   = 8;
     _glfw.hints.blueBits    = 8;
+    _glfw.hints.alphaBits   = 8;
     _glfw.hints.depthBits   = 24;
     _glfw.hints.stencilBits = 8;
 }