chore(release): bump version

imperative/python/version_template.py

@@ -6,4 +6,4 @@
 # Unless required by applicable law or agreed to in writing,
 # software distributed under the License is distributed on an
 # "AS IS" BASIS, WITHOUT ARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-__version__ = "1.6.0.dev"
+__version__ = "1.6.0rc1"

src/core/include/megbrain/version.h

@@ -12,7 +12,7 @@
 #pragma once
 
 #define MGB_MAJOR   8
-#define MGB_MINOR   9999
+#define MGB_MINOR   13
 #define MGB_PATCH   0
 //! whether it is development version
 #ifndef MGB_IS_DEV