bump version to 4.0
diff --git a/pkgconfig.mk b/pkgconfig.mk
index 62b9fd8..919442b 100644
--- a/pkgconfig.mk
+++ b/pkgconfig.mk
@@ -2,8 +2,8 @@
 # To be used to generate capstone.pc for pkg-config
 
 # version major & minor 
-PKG_MAJOR = 3
+PKG_MAJOR = 4
 PKG_MINOR = 0
 
 # version bugfix level. Example: PKG_EXTRA = 1
-PKG_EXTRA = 1
+PKG_EXTRA =