Merge pull request #59 from michaelspiss/patch-2

Provide update script for Windows

tool/update.bat

+@echo off
+
+if exist icons.json (
+    echo Custom icons.json found, using local data only.
+
+    dart .\tool\generate_font.dart .\icons.json
+    dart .\tool\generate_example.dart .\icons.json
+) else (
+    echo Updating free icons to newest version.
+    pushd lib\fonts
+
+    powershell -Command "(New-Object Net.WebClient).DownloadFile('https://raw.githubusercontent.com/FortAwesome/Font-Awesome/master/webfonts/fa-brands-400.ttf', 'fa-brands-400.ttf')"
+    powershell -Command "(New-Object Net.WebClient).DownloadFile('https://raw.githubusercontent.com/FortAwesome/Font-Awesome/master/webfonts/fa-regular-400.ttf', 'fa-regular-400.ttf')"
+    powershell -Command "(New-Object Net.WebClient).DownloadFile('https://raw.githubusercontent.com/FortAwesome/Font-Awesome/master/webfonts/fa-solid-900.ttf', 'fa-solid-900.ttf')"
+
+    popd
+    powershell -Command "(New-Object Net.WebClient).DownloadFile('https://raw.githubusercontent.com/FortAwesome/Font-Awesome/master/metadata/icons.json', 'icons.json')"
+
+    dart .\tool\generate_font.dart .\icons.json
+    dart .\tool\generate_example.dart .\icons.json
+    del "icons.json" /f /q
+)
+
+dartfmt -w .\lib\font_awesome_flutter.dart & ^
+dartfmt -w .\example\lib\icons.dart