Bump dependency packages to latest version

requirements.txt

@@ -6,10 +6,10 @@ cffi==1.13.1
 chardet==3.0.4
 cloudflare==2.6.3
 crypto==1.4.1
-cryptography==2.8
+cryptography==3.2
 defusedxml==0.6.0
 diff-match-patch==20181111
-Django==2.2.8
+Django==2.2.13
 django-appconf==1.0.3
 django-ckeditor==5.7.1
 django-cors-headers==3.1.1
@@ -31,7 +31,7 @@ graphene-django-extras==0.4.8
 graphql-core==2.2.1
 graphql-relay==2.0.0
 gunicorn==19.9.0
-httplib2==0.14.0
+httplib2==0.19.0
 idna==2.8
 jdcal==1.4.1
 MarkupPy==1.14
@@ -40,7 +40,7 @@ oauth2client==4.1.3
 odfpy==1.4.0
 openpyxl==3.0.0
 pilkit==2.0
-Pillow==6.2.1
+Pillow==7.1.0
 promise==2.2.1
 pyasn1==0.4.7
 pyasn1-modules==0.2.7