Move example sketch to appropriately named folder

The Arduino IDE requires the sketch folder name to match the filename of the primary sketch file. On a filename case-sensitive OS like Linux, this includes matching case. This change causes the example sketch to be accessible via the Arduino IDE's File > Examples > LIBRARYNAME menu after the library is installed.

Author: per1234

examples/U8GLib/U8Glib/U8GLib.ino examples/U8GLib/U8GLib/U8GLib.inoexamples/U8GLib/U8Glib/U8GLib.ino renamed to examples/U8GLib/U8GLib/U8GLib.ino

@@ -8,7 +8,7 @@
 ; http://docs.platformio.org/en/stable/projectconf.html
 
 [platformio]
-src_dir=U8Glib
+src_dir=U8GLib
 ; lib_dir=~/Arduino/Libraries
 
 [env:nanoatmega328]