Bump to version 1

The library is well-refactored, identifies grapheme clusters as designed
and the API is stable as well and fully documented.

Signed-off-by: Laslo Hunhold <dev@frign.de>
diff --git a/config.mk b/config.mk
index 11682cf..3408f44 100644
--- a/config.mk
+++ b/config.mk
@@ -1,5 +1,5 @@
 # libgrapheme version
-VERSION = 0
+VERSION = 1
 
 # Customize below to fit your system