Add changelog entries

CHANGELOG-1.0.md

@@ -3,6 +3,20 @@ CHANGELOG
 
 This changelog references the relevant changes done in minor version updates.
 
+1.0.8 (2017-xx-xx)
+------------------
+
+All issues and pull requests under this release may be found under the
+[1.0.8](https://github.com/alcaeus/mongo-php-adapter/issues?q=milestone%3A1.0.8)
+milestone.
+
+ * [#149](https://github.com/alcaeus/mongo-php-adapter/pull/149) fixes calls to
+ `MongoDB::getDBRef` with references containing a `$db` field with a different
+ value than the current database.
+ * [#145](https://github.com/alcaeus/mongo-php-adapter/pull/145) fixes query
+ projections in the legacy syntax. While never documented, this was happily
+ accepted by the legacy driver.
+
 1.0.7 (2016-12-18)
 ------------------