fix(package): update @openui5/themelib_sap_belize to version 1.78.1

Closes #111

Author: greenkeeper[bot]

package.json

@@ -140,7 +140,7 @@
   "dependencies": {
     "@openui5/sap.m": "1.77.2",
     "@openui5/sap.ui.core": "1.77.2",
-    "@openui5/themelib_sap_belize": "1.77.2",
+    "@openui5/themelib_sap_belize": "1.78.1",
     "c3": "https://github.com/pulseshift/c3#master",
     "d3": "5.16.0",
     "lodash.debounce": "4.0.8",