Add antlr as runtime depends (Closes: #896405).

debian/changelog

+python-stringtemplate3 (3.1-4) unstable; urgency=medium
+
+  * Add antlr as runtime depends (Closes: #896405).
+
+ -- Thomas Goirand <zigo@debian.org>  Sat, 21 Apr 2018 14:00:21 +0000
+
 python-stringtemplate3 (3.1-3) unstable; urgency=medium
 
   * Uploading to unstable.

debian/control

@@ -22,6 +22,7 @@ Homepage: http://www.stringtemplate.org/
 Package: python-stringtemplate3
 Architecture: all
 Depends:
+ python-antlr,
  python-six,
  ${misc:Depends},
  ${python:Depends},
@@ -39,6 +40,7 @@ Description: template engine with strict model-view separation - Python 2.7
 Package: python3-stringtemplate3
 Architecture: all
 Depends:
+ python3-antlr,
  python3-six,
  ${misc:Depends},
  ${python3:Depends},