change version to 1.2.0 proper

Author: kilograham

pico_sdk_version.cmake

@@ -9,12 +9,11 @@ set(PICO_SDK_VERSION_MINOR 2)
 set(PICO_SDK_VERSION_REVISION 0)
 # PICO_BUILD_DEFINE: PICO_SDK_VERSION_PRE_RELEASE_ID, optional SDK pre-release version identifier, type=string, group=pico_base
 # PICO_CONFIG: PICO_SDK_VERSION_PRE_RELEASE_ID, optional SDK pre-release version identifier, type=string, group=pico_base
-set(PICO_SDK_VERSION_PRE_RELEASE_ID develop)
 
 # PICO_BUILD_DEFINE: PICO_SDK_VERSION_STRING, SDK version, type=string, group=pico_base
 # PICO_CONFIG: PICO_SDK_VERSION_STRING, SDK version, type=string, group=pico_base
 set(PICO_SDK_VERSION_STRING "${PICO_SDK_VERSION_MAJOR}.${PICO_SDK_VERSION_MINOR}.${PICO_SDK_VERSION_REVISION}")
 
 if (PICO_SDK_VERSION_PRE_RELEASE_ID)
     set(PICO_SDK_VERSION_STRING "${PICO_SDK_VERSION_STRING}-${PICO_SDK_VERSION_PRE_RELEASE_ID}")
-endif()
+endif()