update devlopment dependencis

requirements/development.txt

@@ -14,7 +14,7 @@ django-extensions==1.9.9
 django-import-export==1.0.0
 django-social-authsch==0.1
 django-solo==1.1.3
-django==2.0.10
+django>=2.0.10
 djangorestframework==3.7.7
 et-xmlfile==1.0.1         # via openpyxl
 first==2.0.1              # via pip-tools
@@ -38,10 +38,10 @@ pyjwt==1.5.3              # via social-auth-core
 python-language-server==0.13.0
 python3-openid==3.1.0     # via social-auth-core
 pytz==2017.2              # via django
-pyyaml==4.2b1             # via tablib
+pyyaml>=4.2b1             # via tablib
 requests-oauthlib==0.8.0  # via social-auth-core
-requests==2.20.0          # via requests-oauthlib, social-auth-core
-rope==0.11.0              # via python-language-server
+requests>=2.20.0          # via requests-oauthlib, social-auth-core
+rope>=0.11.0              # via python-language-server
 six==1.10.0               # via django-extensions, pip-tools, pydocstyle, social-auth-app-django, social-auth-core
 snowballstemmer==1.2.1    # via pydocstyle
 social-auth-app-django==2.0.0  # via django-social-authsch
@@ -49,7 +49,7 @@ social-auth-core==1.5.0   # via django-social-authsch, social-auth-app-django
 tablib==0.12.1            # via django-import-export
 typing==3.6.4             # via django-extensions
 unicodecsv==0.14.1        # via tablib
-urllib3==1.23             # via requests
+urllib3>=1.23             # via requests
 xlrd==1.1.0               # via tablib
 xlwt==1.3.0               # via tablib
 yapf==0.20.1              # via python-language-server