Fixing AVR 1.1.12 archiveFileName (issue #42)

Author: jimblom

IDE_Board_Manager/package_sparkfun_index.json

@@ -355,7 +355,7 @@
           "version": "1.1.12",
           "category": "Contributed",
           "url": "https://github.com/sparkfun/Arduino_Boards/raw/master/IDE_Board_Manager/sparkfunboards.1.1.12.tar.bz2",
-          "archiveFileName": "sparkfunboards.1.1.11.tar.bz2",
+          "archiveFileName": "sparkfunboards.1.1.12.tar.bz2",
           "checksum": "SHA-256:034005EAC0255376E3108858238A17CF8654F31400DAC60BF0D756E332C3251D",
           "size": "1249477",
           "help": {