Fix version of nesci and contra

#2

conanfile.py

@@ -26,8 +26,8 @@ class nest(ConanFile):
     description = """NEST is a simulator for spiking neural network models that focuses on the dynamics, size and structure of neural systems rather than on the exact morphology of individual neurons."""
     settings = "os", "compiler", "build_type", "arch"
 
-    requires = (("contra/18.05@RWTH-VR/develop"),
-                ("nesci/18.05@RWTH-VR/develop"),
+    requires = (("contra/18.07@RWTH-VR/develop"),
+                ("nesci/18.07@RWTH-VR/develop"),
 		# ("Qt/5.11.1@bincrafters/stable"),
                 ("conduit/0.3.1@RWTH-VR/thirdparty"))
     generators = "cmake"