image: loose required Python libraries versions, add missing validation

builder/test/tests.py

@@ -36,6 +36,8 @@ from pymavlink import mavutil
 # from espeak import espeak
 from pyzbar import pyzbar
 import docopt
+import geopy
+import flask
 
 print(cv2.getBuildInformation())
 

clover/requirements.txt

@@ -1,4 +1,4 @@
-flask==1.1.1
-geopy==1.11.0
-smbus2==0.3.0
-VL53L1X==0.0.5
+flask
+geopy
+smbus2
+VL53L1X