Use fonts-hack-ttf dependency

Part of #7

Author: thebaer

debian/control

@@ -14,5 +14,5 @@ Standards-Version: 3.9.3
 Package: com.github.writeas.writeas-gtk
 Architecture: any
 Depends: ${misc:Depends}, ${shlibs:Depends}
-Recommends: fonts-open-sans, fonts-hack
+Recommends: fonts-open-sans, fonts-hack-ttf
 Description: A distraction free and private writing tool, with built-in publishing.