changing expression route from get to post to fix current incompatibility

Former-commit-id: 62d025ae2f65d8ab0e4a8ab693b2d920bb63cae0 [formerly 41628282e7fb29e85f7763f3d15d4a278e0108ac]
Former-commit-id: 1d3e0abaccf8d18410b6c70e3d627d57678cb10b

drugstone/views.py

@@ -659,6 +659,9 @@ class TissueExpressionView(APIView):
     """
 
     def get(self, request) -> Response:
+        return self.post(request)
+
+    def post(self, request) -> Response:
         tissue = Tissue.objects.get(id=request.query_params.get('tissue'))
 
         if request.query_params.get('proteins'):