Update dependency email-validator to v1.1.3

Author: renovate-bot

requirements.txt

@@ -1,6 +1,6 @@
 click==7.1.2; python_version >= "2.7" and python_full_version < "3.0.0" or python_full_version >= "3.5.0"
 dnspython==2.1.0; python_version >= "3.6"
-email-validator==1.1.2
+email-validator==1.1.3
 flask-wtf==0.15.1
 flask==1.1.2; (python_version >= "2.7" and python_full_version < "3.0.0") or (python_full_version >= "3.5.0")
 idna==3.1; python_version >= "3.4"