Update RDFLib (for using dirty_reads); include complete dependency list.

requirements.txt

@@ -1,8 +1,25 @@
 arrow==0.10.0
+certifi==2017.7.27.1
+chardet==3.0.4
+click==6.7
+dateutils==0.6.6
 Flask==0.12.2
+gunicorn==19.7.1
+idna==2.6
+isodate==0.5.4
+itsdangerous==0.24
+Jinja2==2.9.6
+MarkupSafe==1.0
+py==1.4.34
+pyparsing==2.2.0
 pytest==3.2.2
+python-dateutil==2.6.1
+pytz==2017.2
 PyYAML==3.12
-rdflib==4.2.2
+rdflib==5.0.0.dev0
 requests==2.18.4
 requests-toolbelt==0.8.0
+six==1.10.0
 SPARQLWrapper==1.8.0
+urllib3==1.22
+Werkzeug==0.12.2