add syntax hightlighting for unshift

syntaxes/kanata.tmLanguage.json

@@ -56,7 +56,7 @@
         },
         {
             "_description": "list actions",
-            "match": "(?:\\s|[()])(layer-switch|layer-toggle|layer-while-held|tap-hold|tap-hold-press|tap-hold-release|tap-hold-press-timeout|tap-hold-release-timeout|tap-hold-release-keys|multi|macro|macro-repeat|macro-release-cancel|macro-repeat-release-cancel|unicode|one-shot|one-shot-press|one-shot-release|one-shot-press-pcancel|one-shot-release-pcancel|tap-dance|tap-dance-eager|chord|release-key|release-layer|on-press-fakekey|on-release-fakekey|on-press-fakekey-delay|on-release-fakekey-delay|on-idle-fakekey|mwheel-up|mwheel-down|mwheel-left|mwheel-right|movemouse-up|movemouse-down|movemouse-left|movemouse-right|movemouse-accel-up|movemouse-accel-down|movemouse-accel-left|movemouse-accel-right|movemouse-speed|setmouse|dynamic-macro-record|dynamic-macro-play|arbitrary-code|cmd|cmd-output-keys|fork|caps-word|caps-word-custom|dynamic-macro-record-stop-truncate|switch|sequence|unmod)(?=\\s|[()])",
+            "match": "(?:\\s|[()])(layer-switch|layer-toggle|layer-while-held|tap-hold|tap-hold-press|tap-hold-release|tap-hold-press-timeout|tap-hold-release-timeout|tap-hold-release-keys|multi|macro|macro-repeat|macro-release-cancel|macro-repeat-release-cancel|unicode|one-shot|one-shot-press|one-shot-release|one-shot-press-pcancel|one-shot-release-pcancel|tap-dance|tap-dance-eager|chord|release-key|release-layer|on-press-fakekey|on-release-fakekey|on-press-fakekey-delay|on-release-fakekey-delay|on-idle-fakekey|mwheel-up|mwheel-down|mwheel-left|mwheel-right|movemouse-up|movemouse-down|movemouse-left|movemouse-right|movemouse-accel-up|movemouse-accel-down|movemouse-accel-left|movemouse-accel-right|movemouse-speed|setmouse|dynamic-macro-record|dynamic-macro-play|arbitrary-code|cmd|cmd-output-keys|fork|caps-word|caps-word-custom|dynamic-macro-record-stop-truncate|switch|sequence|unmod|unshift)(?=\\s|[()])",
             "captures": {
                 "1": {
                     "name": "entity.name.function.kanata"