Use PEP 508 URL format for charm-crypto dependency

The pip option `--process-dependency-links` is no longer supported.

Author: sbellem

Dockerfile

@@ -26,7 +26,7 @@ WORKDIR $SRC
 ADD . $SRC/
 
 RUN pip install --upgrade pip
-RUN pip install --process-dependency-links -e .[dev]
+RUN pip install -e .[dev]
 
 # Run tests by default
 CMD sh test.sh

setup.py

@@ -27,7 +27,7 @@
     'ecdsa',
     'zfec>=1.5.0',
     'gipc',
-    'charm-crypto>=0.50',
+    'charm-crypto @ https://github.com/JHUISI/charm.git@dev',
     'coincurve',
 ]
 
@@ -81,7 +81,4 @@
         'dev': dev_require + tests_require + docs_require,
         'docs': docs_require,
     },
-    dependency_links=[
-        'git+https://github.com/JHUISI/charm.git@dev#egg=0.50',
-    ],
 )