Use ".git" in gitmodules for pycamera

this may have prevented the library from being released

Author: jepler

.gitmodules

@@ -985,4 +985,4 @@
 	url = https://github.com/adafruit/Adafruit_CircuitPython_ADS7830.git
 [submodule "libraries/helpers/pycamera"]
 	path = libraries/helpers/pycamera
-	url = https://github.com/adafruit/Adafruit_CircuitPython_PyCamera/
+	url = https://github.com/adafruit/Adafruit_CircuitPython_PyCamera.git