Add changelog

CHANGELOG.md

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+CHANGELOG
+=========
+
+This changelog references the relevant changes done in minor version updates.
+
+1.0.0-BETA1 (2016-02-xx)
+------------------------
+
+All issues and pull requests under this release may be found under the
+[1.0.0-BETA1](https://github.com/alcaeus/mongo-php-adapter/issues?q=milestone%3A1.0.0-BETA1)
+milestone.
+
+ * [#52](https://github.com/alcaeus/mongo-php-adapter/pull/52) fixes behavior of
+ `MongoCollection::update` when no update operators have been given.
+ * [#53](https://github.com/alcaeus/mongo-php-adapter/pull/53) fixes an error
+ where some operations would send an invalid query to the MongoDB server,
+ causing command failures.
+ * [#54](https://github.com/alcaeus/mongo-php-adapter/pull/54) and
+ [#55](https://github.com/alcaeus/mongo-php-adapter/pull/55) fix the handling of
+ documents with numeric keys.
+ * [#56](https://github.com/alcaeus/mongo-php-adapter/pull/56) fixes the
+ behavior of `MongoGridFS::findOne` when no results are found.
+ * [#59](https://github.com/alcaeus/mongo-php-adapter/pull/59) adds handling for
+ the `includeSystemCollections` parameter in `MongoDB::getCollectionInfo` and
+ `MongoDB::getCollectionNames`.
+ * [#62](https://github.com/alcaeus/mongo-php-adapter/pull/62) removes the
+ manual comparison of index options to rely on the MongoDB server to decide
+ whether an index already exists.
+ * [#63](https://github.com/alcaeus/mongo-php-adapter/pull/63) prevents
+ serialization of driver classes which are not serializable.
+
+0.1.0 (2016-02-06)
+------------------
+
+Initial development release.