Fix requirements base.txt

requirements/base.txt

@@ -2,20 +2,20 @@ Django[bcrypt]==2.2.7
 psycopg2-binary==2.8.3
 pytz==2019.1
 sqlparse==0.3.0
-requests
-django-solo
-easy-thumbnails
-fcm-django
-django-easy-select2
-bootstrap-admin
+requests==2.22.0
+django-solo==1.1.3
+easy-thumbnails==2.6
+fcm-django==0.3.2
+django-easy-select2==1.5.6
+bootstrap-admin==0.4.3
 drf-yasg==1.16.0
-timezonefinder
+timezonefinder==4.1.0
 PySocks!=1.5.7,>=1.5.6;
 
 djangorestframework==3.9.4
-markdown
+Markdown==3.1.1
 django-filter==2.1.0
-djangorestframework-xml
+djangorestframework-xml==1.4.0
 geoip2==2.9.0
 pycountry==19.8.18
 django-phonenumber-field[phonenumbers]==2.1.0