fix bug in bulk_update, update documentation, update readme, bump version

docs/releases.md

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+# 0.3.8
+
+*  Added possibility to provide alternative database column names with name parameter to all fields.
+*  Fix bug with selecting related ManyToMany fields with `fields()` if they are empty.
+*  Updated documentation
+
+# 0.3.7
+
+*  Publish documentation and update readme
+
+# 0.3.6
+
+*  Add fields() method to limit the selected columns from database - only nullable columns can be excluded.
+*  Added UniqueColumns and constraints list in model Meta to build unique constraints on list of columns.
+*  Added UUID field type based on Char(32) column type.
+
+# 0.3.5
+
+*  Added bulk_create and bulk_update for operations on multiple objects.
+
+# 0.3.4
+
+Add queryset level methods
+*  delete
+*  update
+*  get_or_create
+*  update_or_create
+
+# 0.3.3
+
+*  Add additional filters - startswith and endswith
+
+# 0.3.2
+
+*  Add choices parameter to all fields - limiting the accepted values to ones provided
+
+# 0.3.1
+
+*  Added exclude to filter where not conditions.
+*  Added tests for mysql and postgres with fixes for postgres.
+*  Rafactors and cleanup.
+
+# 0.3.0
+
+* Added ManyToMany field and support for many to many relations