Update doc in changelog and version in setup.py

Signed-off-by: Chin Yeung Li <[email protected]>

Author: chinyeungli

docs/CHANGELOG.rst

@@ -1,12 +1,11 @@
-2018-x-x
+2018-09-19
 
     Release 3.1.2
 
     * New `--vartext` option for `attrib`
-    * Add support for `checksum_sha256`
-    * `check` command will not counted INFO message as error when `--verbose` is set
+    * Add support for `checksum_sha256` and `author_file`
+    * `check` command will not count INFO message as error when `--verbose` is set
     * Update `track_change` to `track_changes`
-    * Add support for `author_file`
     * New `--filter` and `--mapping-output` options for `inventory`
 
 2018-6-25

setup.py

@@ -24,7 +24,7 @@ def read(*names, **kwargs):
 
 setup(
     name='aboutcode-toolkit',
-    version='3.1.0',
+    version='3.1.2',
     license='Apache-2.0',
     description=(
         'AboutCode-toolkit is a tool to document the provenance (origin and license) of '