Add minimum pygame version check for #9

Author: Gadgetoid

examples/pygame-basic.py

@@ -10,6 +10,10 @@
 
 print("""Display HAT Mini: Basic Pygame Demo""")
 
+if pygame.vernum < (3, 0, 0):
+    print("Need PyGame >= 2.0.0:\n    python3 -m pip install pygame --upgrade")
+    sys.exit(1)
+
 
 def _exit(sig, frame):
     global running

examples/pygame-button-interrupt.py

@@ -11,6 +11,10 @@
 
 print("""Display HAT Mini: Basic Pygame Demo""")
 
+if pygame.vernum < (2, 0, 0):
+    print("Need PyGame >= 2.0.0:\n    python3 -m pip install pygame --upgrade")
+    sys.exit(1)
+
 
 def _exit(sig, frame):
     global running

examples/pygame-demo.py

@@ -12,6 +12,10 @@
 
 print("""Display HAT Mini: Pygame Demo""")
 
+if pygame.vernum < (2, 0, 0):
+    print("Need PyGame >= 2.0.0:\n    python3 -m pip install pygame --upgrade")
+    sys.exit(1)
+
 
 hue_to_rgb = []