CMakeLists.txt: API version should be 0.5.1 instead of 0.5

Also: modernised version setting.

CMakeLists.txt

@@ -1,6 +1,7 @@
 cmake_minimum_required(VERSION 3.1)
 
-project(qmatrixclient CXX)
+set(API_VERSION "0.5.1") # Normally it should just include major.minor
+project(qmatrixclient VERSION "${API_VERSION}.1" LANGUAGES CXX)
 
 option(QMATRIXCLIENT_INSTALL_EXAMPLE "install qmc-example application" ON)
 
@@ -58,6 +59,7 @@ message( STATUS )
 message( STATUS "=============================================================================" )
 message( STATUS "                       libqmatrixclient Build Information" )
 message( STATUS "=============================================================================" )
+message( STATUS "Version: ${PROJECT_VERSION}, API version: ${API_VERSION}")
 if (CMAKE_BUILD_TYPE)
     message( STATUS "Build type: ${CMAKE_BUILD_TYPE}")
 endif(CMAKE_BUILD_TYPE)
@@ -145,9 +147,7 @@ add_library(QMatrixClient ${libqmatrixclient_SRCS}
             ${libqmatrixclient_job_SRCS} ${libqmatrixclient_csdef_SRCS}
             ${libqmatrixclient_cswellknown_SRCS}
             ${libqmatrixclient_asdef_SRCS} ${libqmatrixclient_isdef_SRCS})
-set(API_VERSION "0.5")
-set(FULL_VERSION "${API_VERSION}.1")
-set_property(TARGET QMatrixClient PROPERTY VERSION "${FULL_VERSION}")
+set_property(TARGET QMatrixClient PROPERTY VERSION "${PROJECT_VERSION}")
 set_property(TARGET QMatrixClient PROPERTY SOVERSION ${API_VERSION} )
 set_property(TARGET QMatrixClient PROPERTY
              INTERFACE_QMatrixClient_MAJOR_VERSION ${API_VERSION})
@@ -179,7 +179,6 @@ include(CMakePackageConfigHelpers)
 # Maybe consider jumping the gun and releasing 1.0, as semver advises?
 write_basic_package_version_file(
     "${CMAKE_CURRENT_BINARY_DIR}/QMatrixClient/QMatrixClientConfigVersion.cmake"
-    VERSION ${FULL_VERSION}
     COMPATIBILITY SameMajorVersion
 )