Increase API version

Please do this whenever necessary. And adapt it before releasing a new
RC. The RC should already have the correct one.

src/CMakeLists.txt

@@ -3,7 +3,7 @@ project(raylib)
 include(GNUInstallDirs)
 
 set(PROJECT_VERSION 2.0.0)
-set(API_VERSION 1)
+set(API_VERSION 2)
 set(RAYLIB raylib)    # Name of the generated library
 
 include("CMakeOptions.txt")

src/Makefile

@@ -43,7 +43,7 @@
 
 # Define required raylib variables
 RAYLIB_VERSION     = 2.0.0
-RAYLIB_API_VERSION = 1
+RAYLIB_API_VERSION = 2
 
 # See below for alternatives.
 RAYLIB_PATH        = ..