add missing botocore dependency and move production settings dependencies to production.txt

requirements/base.txt

@@ -3,7 +3,6 @@ django-dotenv==1.4.1
 # elasticsearch==2.3.0 chosen for compatibility with t2.micro.elasticsearch and t2.small.elasticsearch
 # instance types on AWS. Adjust for your deployment as needed.
 elasticsearch==2.3.0
-requests-aws4auth==0.9
 wagtail==1.12
 wagtailfontawesome==1.0.6
 Pillow==4.0.0

requirements/production.txt

@@ -6,3 +6,6 @@ psycopg2==2.6.2
 whitenoise==3.2.2
 boto==2.45.0
 django-storages==1.5.2
+# For retrieving credentials and signing requests to Elasticsearch
+botocore==1.7.2
+requests-aws4auth==0.9