fix bind[code|sym] --release (Thanks paolo)

fixes #890

parser-specs/config.spec

@@ -270,6 +270,8 @@ state FONT:
 
 # bindsym/bindcode
 state BINDING:
+  release = '--release'
+      ->
   modifiers = 'Mod1', 'Mod2', 'Mod3', 'Mod4', 'Mod5', 'Shift', 'Control', 'Ctrl', 'Mode_switch'
       ->
   '+'
@@ -313,6 +315,8 @@ state MODE_IGNORE_LINE:
       -> MODE
 
 state MODE_BINDING:
+  release = '--release'
+      ->
   modifiers = 'Mod1', 'Mod2', 'Mod3', 'Mod4', 'Mod5', 'Shift', 'Control', 'Ctrl', 'Mode_switch'
       ->
   '+'

testcases/t/201-config-parser.t

@@ -44,6 +44,7 @@ my $config = <<'EOT';
 mode "meh" {
     bindsym Mod1 + Shift +   x resize grow
     bindcode Mod1+44 resize shrink
+    bindsym --release Mod1+x exec foo
 }
 EOT
 
@@ -51,6 +52,7 @@ my $expected = <<'EOT';
 cfg_enter_mode(meh)
 cfg_mode_binding(bindsym, Mod1,Shift, x, (null), resize grow)
 cfg_mode_binding(bindcode, Mod1, 44, (null), resize shrink)
+cfg_mode_binding(bindsym, Mod1, x, --release, exec foo)
 EOT
 
 is(parser_calls($config),