keep version numbers consistent

--- src/CMakeLists.txt      2017-12-25 10:39:21.000000000 +0100
+++ src/CMakeLists.txt      2017-12-27 19:38:53.770975434 +0100
@@ -4,7 +4,7 @@
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 include(DisallowInSource)

-project(cutter VERSION 1.0)
+project(cutter VERSION 1.1)

 set(CMAKE_CXX_STANDARD 11)