common: 1.8 release

ChangeLog

-Wed Jan 29 2020 Marcin Ślusarz <marcin.slusarz@intel.com>
+Fri Jan 31 2020 Marcin Ślusarz <marcin.slusarz@intel.com>
 
-	* Version 1.8-rc2
+	* Version 1.8
 
 	This release:
 	- Introduces new API in libpmemobj for user-assisted defragmentation

GIT_VERSION

-$Format:%h %d$
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README.md

@@ -165,7 +165,7 @@ To build from source, clone this tree:
 
 For a stable version, checkout a [release tag](https://github.com/pmem/pmdk/releases) as follows. Otherwise skip this step to build the latest development release.
 ```
-	$ git checkout tags/1.7
+	$ git checkout tags/1.8
 ```
 
 Once the build system is setup, the Persistent Memory Development Kit is built using the `make` command at the top level:

VERSION

+1.8