(css,js) Update md to v1.1.20

NEWS

@@ -11,6 +11,7 @@ Enhancements
  - [web] avoid saving an empty calendar name
  - [web] prohibit duplicate contact categories in Preferences module
  - [web] improve constrat of text in toolbar with input fields
+ - [web] updated Angular Material to version 1.1.20
 
 Bug fixes
  - [web] properly handle Windows-1256 charaset (#4781)

UI/WebServerResources/package.json

@@ -8,7 +8,7 @@
     "angular-aria": "1.7.x",
     "angular-cookies": "1.7.x",
     "angular-file-upload": "latest",
-    "angular-material": "1.1.19",
+    "angular-material": "1.1.20",
     "angular-messages": "1.7.x",
     "angular-sanitize": "1.7.x",
     "angular-ui-router": "1.0.x",