adds dev version of juliapkg.json which uses local PythonCall

Author: Christopher Doris

pysrc/juliacall/juliapkg-dev.json

@@ -0,0 +1,11 @@
+{
+    "julia": "1.6.1",
+    "packages": {
+        "PythonCall": {
+            "uuid": "6099a3de-0909-46bc-b1f4-468b9a2dfc0d",
+            "version": "0.9.3",
+            "path": "../..",
+            "dev": true
+        }
+    }
+}