use NotoSerif fonts instead of Driod_Serif

Author: archmoj

test/image/mocks/fonts.json

@@ -190,14 +190,14 @@
             },
             {
                 "yanchor":"middle",
-                "text":"Droid Serif <b>Bold</b> <i>Italic</i>",
+                "text":"Noto Serif <b>Bold</b> <i>Italic</i>",
                 "arrowsize":1,
                 "textangle":0,
                 "borderwidth":1,
                 "ay":-27.0390625,
                 "ax":-10,
                 "font":{
-                    "family":"Droid Serif, serif",
+                    "family":"Noto Serif, serif",
                     "size":20
                 },
                 "arrowcolor":"",

test/image/mocks/geo_canadian-cities.json

@@ -80,7 +80,7 @@
             }
         },
         "font": {
-            "family": "Droid Serif, serif"
+            "family": "Noto Serif, serif"
         },
         "geo": {
             "scope": "north america",

test/image/mocks/geo_text_chart_arrays.json

@@ -100,7 +100,7 @@
                     "Balto, sans-serif",
                     "Courier New, monospace",
                     "Noto Sans, sans-serif",
-                    "Droid Serif, serif",
+                    "Noto Serif, serif",
                     "Droid Sans Mono, sans-serif",
                     "Gravitas One, cursive",
                     "Old Standard TT, serif",

test/image/mocks/gl2d_fonts.json

@@ -246,10 +246,10 @@
                 "y": 0.6363636363636364,
                 "xref": "paper",
                 "yref": "paper",
-                "text": "Droid Serif <b>Bold</b> <i>Italic</i>",
+                "text": "Noto Serif <b>Bold</b> <i>Italic</i>",
                 "showarrow": false,
                 "font": {
-                    "family": "Droid Serif, serif",
+                    "family": "Noto Serif, serif",
                     "size": 20
                 },
                 "xanchor": "left",