silence stdout on prune

setup.py

@@ -7,7 +7,7 @@ README_MD = open(join(dirname(abspath(__file__)), "README.md")).read()
 
 setup(
     name="trueupdate",
-    version="2.1.5",
+    version="2.1.6",
 
     # The packages that constitute your project.
     # For my project, I have only one - "pydash".

trueupdate/__init__.py

@@ -112,10 +112,7 @@ def docker_prune():
     if PRUNE:
       print("Pruning old docker images...\n")
       process = subprocess.Popen(["docker", "image", "prune", "-af"], stdout=subprocess.PIPE)
-      while process.poll() is None:
-          lines = process.stdout.readline()
-          print (lines)
-      print (process.stdout.read())
+      print("Images pruned.\n")
   
 def run():
     process_args()