NumericLiterals auto-gen-config Off By One

[tmorris-fiksu]

rubocop --auto-gen-config does not correctly repair the NumericLiterals cop.
For a 6 digit number, the following is generated:

NumericLiterals:
  MinDigits: 6

Either the cop should ignore 6 digit numbers or the cop's auto-gen should be 7.

Sample file and version:

$ cat sample.rb
y = 123456
puts y
$ rubocop -V
0.19.0 (using Parser 2.1.7, running on ruby 1.9.3 x86_64-darwin12.5.0)

[jonas054]

You're right. I'll fix it.

[tmorris-fiksu]

I just put in a PR for this. Hopefully, I beat you to it. A simple one to get my feet wet: #887