Feature/154 add gnome shell 3 22 compability
requested to merge github/fork/rstangl/feature/154-Add_gnome_shell_3_22_compability into feature/154-Add_gnome_shell_3_22_compability
Created by: rstangl
Fix version string in metadata.json
Without "" a parse error was caused in gnome-shell 3.22
JS ERROR: Could not load extension hamster@projecthamster.wordpress.com: Error: Failed to parse metadata.json: SyntaxError: JSON.parse: expected ',' or '}' after property value in object