only search for 1.16.x releases, the only ones supporting python2

debian/changelog

@@ -11,7 +11,11 @@ python-numpy (1:1.16.2-2) UNRELEASED; urgency=medium
     override_dh_auto_build-indep. Thanks Jason Duerstock.
     Closes: #929975
 
- -- Ondřej Nový <onovy@debian.org>  Sat, 20 Jul 2019 00:06:17 +0200
+  [ Sandro Tosi ]
+  * debian/watch
+    - only search for 1.16.x releases, the only ones supporting python2
+
+ -- Sandro Tosi <morph@debian.org>  Fri, 06 Sep 2019 20:39:01 -0400
 
 python-numpy (1:1.16.2-1) unstable; urgency=medium
 

debian/watch

 version=4
 opts=uversionmangle=s/(rc|a|b|c)/~$1/ \
-https://pypi.debian.net/numpy/numpy-(.+)\.(?:zip|tgz|tbz|txz|(?:tar\.(?:gz|bz2|xz)))
+https://pypi.debian.net/numpy/numpy-(1.16.*)\.(?:zip|tgz|tbz|txz|(?:tar\.(?:gz|bz2|xz)))
 #opts="pgpmode=none" \
 #    https://pypi.python.org/pypi/numpy/ \
 #    https://pypi.python.org/packages/.*/.*/.*/numpy-([\d\.]+).zip#.*