[Release] Modify release version to 1.1.0

Author: czkkkkkk

python/update_version.py

@@ -16,7 +16,7 @@
 # (usually "aYYMMDD")
 # The environment variable DGL_VERSION_SUFFIX is the local version label
 # suffix for indicating CPU and CUDA versions as in PEP 440 (e.g. "+cu102")
-__version__ = "1.1" + os.getenv("DGL_PRERELEASE", "")
+__version__ = "1.1.0" + os.getenv("DGL_PRERELEASE", "")
 __version__ += os.getenv("DGL_VERSION_SUFFIX", "")
 print(__version__)