fix(api): security updates on build, remove outdated dependencies

api/requirements.txt

@@ -1,22 +1,10 @@
-Django==1.10.3
-mysqlclient==1.3.9
-Pygments==2.0.1
-argparse==1.2.1
-cffi==1.9.1
-coverage==3.7.1
-cryptography==1.5.3
-djangorestframework==3.5.4
-djoser==0.5.2
-dnspython==1.15.0
-enum34==1.1.6
-httpretty==0.8.14
-idna==2.0
-ipaddress==1.0.7
-pyOpenSSL==0.15.1
-pyasn1==0.1.7
-pycparser==2.13
-requests==2.7.0
-six==1.9.0
-uwsgi==2.0.14
-django-nocaptcha-recaptcha==0.0.19
-sqlparse==0.2.3
+Django==1.10.*
+mysqlclient==1.3.*
+djangorestframework==3.5.*
+djoser==0.5.*
+dnspython==1.15.*
+httpretty==0.8.*
+requests==2.7.*
+uwsgi==2.0.*
+django-nocaptcha-recaptcha==0.0.19  # updated manually
+sqlparse==0.2.*