update appium-uiauto with predicate search fix

package.json

@@ -44,7 +44,7 @@
     "appium-adb": "~1.3.15",
     "appium-atoms": "~0.0.5",
     "appium-instruments": "~1.4.4",
-    "appium-uiauto": "~1.7.6",
+    "appium-uiauto": "~1.7.7",
     "argparse": "~0.1.15",
     "async": "~0.9.0",
     "binary-cookies": "~0.1.1",

submodules/appium-uiauto

@@ -1 +1 @@
-Subproject commit 74f78cb4c87da34e3724cba0918f943d8797f592
+Subproject commit d545ac74a5d1de10356369961b8dd6631c3f1cb7