update changelog, fix build errrors

Author: RonnyDo

data/com.github.ronnydo.colorpicker.appdata.xml

@@ -22,7 +22,7 @@
 	<category>Development</category>
   </categories>
   <releases>
-	​<release version="1.0.3" date="2018-04-26" urgency="medium">
+	​<release version="1.0.4" date="2018-04-26" urgency="medium">
 	​  <description>
 	    <ul>
 		  <li>Implement 'close with right-mouse-button' feature (issue #27)</li>

debian/changelog

@@ -1,4 +1,4 @@
-com.github.ronnydo.colorpicker (1.0.3) xenial; urgency=low
+com.github.ronnydo.colorpicker (1.0.4) xenial; urgency=low
 
   * Implement 'close with right-mouse-button' feature (issue #27)
   * Update icon