Update rpitx.py with white and black text in sstv

rpitx.py

@@ -393,7 +393,8 @@ if __name__ == "__main__":
 					print("Photo taken")
 
 					file='/home/pi/CubeSatSim/camera_out.jpg'
-					font1 = ImageFont.truetype('DejaVuSerif-Bold.ttf', 20)
+					font1 = ImageFont.truetype('DejaVuSerif.ttf', 20)
+					font2 = ImageFont.truetype('DejaVuSerif-Bold.ttf', 20)
 
 					try:
 						filep = open("/home/pi/CubeSatSim/telem_string.txt")
@@ -406,6 +407,8 @@ if __name__ == "__main__":
 					
 					img = Image.open(file)
 					draw = ImageDraw.Draw(img) 
+					draw.text((10, 10), callsign, font=font2, fill='white')
+					draw.text((120, 10), telem_string, font=font2, fill='white')					
 					draw.text((10, 10), callsign, font=font1, fill='black')
 					draw.text((120, 10), telem_string, font=font1, fill='black')
 					img.save(file)