update CHANGELOG and bump version to 5.2.2

Author: basepi

CHANGELOG.md

@@ -1,6 +1,11 @@
 # Changelog
 
-=======
+## v5.2.2
+[Check the diff](https://github.com/elastic/apm-agent-python/compare/v5.2.1...v5.2.2)
+
+### Bugfixes
+ * fixed an issue where a `cpu_total` of `0` could cause an exception (#610, #611)
+
 ## v5.2.1
 [Check the diff](https://github.com/elastic/apm-agent-python/compare/v5.2.0...v5.2.1)
 

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__ = (5, 2, 1)
+__version__ = (5, 2, 2)
 VERSION = ".".join(map(str, __version__))