update CHANGELOG and bump version to 6.3.1

Author: beniwohli

CHANGELOG.asciidoc

@@ -33,6 +33,14 @@ endif::[]
 [[release-notes-6.x]]
 === Python Agent version 6.x
 
+[[release-notes-6.3.1]]
+==== 6.3.1 - 2021/07/07
+
+[float]
+===== Bug fixes
+
+* Fix issue with Starlette/FastAPI hanging on startup {pull}1185[#1185]
+
 [[release-notes-6.3.0]]
 ==== 6.3.0 - 2021/07/06
 

elasticapm/version.py

@@ -28,5 +28,5 @@
 #  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 #  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-__version__ = (6, 3, 0)
+__version__ = (6, 3, 1)
 VERSION = ".".join(map(str, __version__))