Updating python dependencies

Update of Python packages (using pip-compile) in preparation for
Release FOURTEEN

Change-Id: I5212ca417f5d818d6e18718eb3adf6b9f6a06a58
Signed-off-by: Mark Beierl <mark.beierl@canonical.com>
diff --git a/requirements.in b/requirements.in
index 5185d7a..661da61 100644
--- a/requirements.in
+++ b/requirements.in
@@ -11,6 +11,7 @@
 #     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 #     See the License for the specific language governing permissions and
 #     limitations under the License.
+charset-normalizer<3 # Required by aiohttp in LCM
 juju==3.0.0
 kubernetes
 motor==1.3.1