chore: bump version numbers (#32)

I need to create a v0.4.x release and the version numbers are at v0.3.0

Author: coryan

CMakeLists.txt

@@ -21,8 +21,8 @@ set(PACKAGE_BUGREPORT "https://github.com/googleapis/google-cloud-cpp/issues")
 project(googleapis-cpp-protos CXX C)
 
 set(GOOGLEAPIS_CPP_PROTOS_VERSION_MAJOR 0)
-set(GOOGLEAPIS_CPP_PROTOS_VERSION_MINOR 3)
-set(GOOGLEAPIS_CPP_PROTOS_VERSION_PATCH 0)
+set(GOOGLEAPIS_CPP_PROTOS_VERSION_MINOR 4)
+set(GOOGLEAPIS_CPP_PROTOS_VERSION_PATCH 1)
 
 string(CONCAT GOOGLE_APIS_CPP_PROTOS_VERSION
               "${GOOGLEAPIS_CPP_PROTOS_VERSION_MAJOR}"