Removed unnecessary "usage" prefix from mako-render script.

Pull request courtesy Hugo.

(cherry picked from commit 7e6a1d7822bac275aabb3c1cc90cb67612548127)

Change-Id: I84a302c982f18762d2514c3f840331d1eb3ebcda

doc/build/changelog.rst

diff --git a/doc/build/changelog.rst b/doc/build/changelog.rst
index bb592c9..46e9e98 100644
--- a/doc/build/changelog.rst
+++ b/doc/build/changelog.rst
@@ -15,6 +15,12 @@
      Added ``--output-encoding`` flag to the mako-render script.
      Pull request courtesy lacsaP.
 
+    .. change::
+        :tags: bug
+
+    Removed unnecessary "usage" prefix from mako-render script.
+    Pull request courtesy Hugo.
+
 .. changelog::
     :version: 1.0.7
     :released: Thu Jul 13 2017

mako/cmd.py

diff --git a/mako/cmd.py b/mako/cmd.py
index 609b4c9..ff738c4 100755
--- a/mako/cmd.py
+++ b/mako/cmd.py
@@ -24,7 +24,7 @@
 
 def cmdline(argv=None):
 
-    parser = ArgumentParser("usage: %prog [FILENAME]")
+    parser = ArgumentParser()
     parser.add_argument(
         "--var", default=[], action="append",
         help="variable (can be used multiple times, use name=value)")