Add changelog from github releases

CHANGELOG.md

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+# Changelog
+
+## v1.0.10
+
+* Make require calls rpm-friendly [[#3]](https://github.com/sandfoxme/journald-native/pull/3)
+* Fix compilation problems on some systems due to CFLAGS being overwritten
+
+## v1.0.9
+
+* Change license to LGPL 2.1 or later to match systemd
+* Change C version from C99 to C11
+* Use safer xmalloc/xfree memory allocation functions from Ruby API
+* Add tests
+
+## v1.0.8
+
+**1.0.8 was missed due to a technical error, sorry**
+
+## v1.0.7
+
+C extention updated to 1.0.6 features, released as 1.0.7
+
+Returning to C due to overgrown complexity of C++ template wrapper code for Ruby exception handling
+
+## v1.0.6
+
+*  No longer accepts strings with zero byte as valid
+
+## v1.0.5
+
+* Dummy detection const & method
+  ```ruby
+  Journald::Native.dummy?    # true on linux,
+  Journald::Native::IS_DUMMY # false otherwise
+  ```
+
+## v1.0.4
+
+* Port extention from C to C++11
+* Make everything memory and exception safe
+
+## v1.0.3
+
+* Dummy compilation on MacOS and Windows (dummy sd_journal_* calls that return 0 doing nothing)
+* Link to libsystemd instead of libsystemd-journal on newer systems
+
+Please note that the gem still won't compile on Linux system without systemd-journal
+
+## v1.0.2
+
+* Fixed possible memory leak in function send()
+
+## v1.0.1
+
+* Fixed wrong dependency on ruby
+
+## v1.0.0
+
+Initial release