s/Breaks/Conflicts/ in debian/control

Otherwise people can't upgrade from matrix-synapse without removing it first

debian/changelog

+matrix-synapse-py3 (0.34.1.1+1) UNRELEASED; urgency=medium
+
+  * Update conflicts specifications to allow smoother transition from matrix-synapse.
+
+ -- Synapse Packaging team <packages@matrix.org>  Fri, 11 Jan 2019 17:04:28 +0000
+
 matrix-synapse-py3 (0.34.1.1) stable; urgency=high
 
   * New synapse release 0.34.1.1

debian/control

@@ -19,9 +19,9 @@ Homepage: https://github.com/matrix-org/synapse
 Package: matrix-synapse-py3
 Architecture: amd64
 Provides: matrix-synapse
-Breaks:
- matrix-synapse (<< 0.34.0-0matrix2),
- matrix-synapse (>= 0.34.0-1),
+Conflicts:
+ matrix-synapse (<< 0.34.0.1-0matrix2),
+ matrix-synapse (>= 0.34.0.1-1),
 Pre-Depends: dpkg (>= 1.16.1)
 Depends:
  adduser,