fix version

Author: Christopher Doris

pysrc/juliacall/juliapkg-dev.json

@@ -3,7 +3,7 @@
     "packages": {
         "PythonCall": {
             "uuid": "6099a3de-0909-46bc-b1f4-468b9a2dfc0d",
-            "version": "0.9.4",
+            "version": "=0.9.4",
             "path": "../..",
             "dev": true
         }