update Django to 1.11.18, as lower versions are vulnerable

Author: Lego Las

.pre-commit-config.yaml

@@ -5,7 +5,7 @@ repos:
     - id: black
       language_version: python3.6
 -   repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v1.3.0
+    rev: v1.3.1
     hooks:
     - id: flake8
       args: [aileen]

requirements.txt

@@ -4,7 +4,7 @@ black==18.9b0
 certifi==2018.10.15
 chardet==3.0.4
 Click==7.0
-Django==1.11.16
+Django==1.11.18
 django-bootstrap3==11.0.0
 django-geojson==2.10.0
 django-leaflet==0.24.0