Setup dev for next release.

Changelog

@@ -1,3 +1,5 @@
+v1.5.3: (unreleased)
+
 v1.5.2: Procrastination in progress
 	- Clearify Check dependency. (#879)
 	- Add option to change negate character. (#877)

configure.ac

@@ -1,4 +1,4 @@
-AC_INIT([rofi], [1.5.2], [https://github.com/DaveDavenport/rofi/],[],[https://reddit.com/r/qtools/])
+AC_INIT([rofi], [1.5.2-dev], [https://github.com/DaveDavenport/rofi/],[],[https://reddit.com/r/qtools/])
 
 AC_CONFIG_SRCDIR([source/rofi.c])
 AC_CONFIG_HEADER([config.h])

meson.build

@@ -1,5 +1,5 @@
 project('rofi', 'c',
-    version: '1.5.2',
+    version: '1.5.2-dev',
     meson_version: '>=0.47.0',
     license: [ 'MIT' ],
     default_options: [