add a context manger to progsteps

Author: mkolopanis

pyuvsim/utils.py

@@ -41,6 +41,12 @@ def __init__(self, maxval=None):
         self.curval = 0
         self.remain = None
 
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        self.finish()
+
     def update(self, count):
         """
         Update the progress bar.