support for CRLF line terminators

[josesan9]

Hi,
The current version does not seem to be able to read files with CRLF terminators.
I think this is causing it to effectively comment out all of the code.
noticed because it worked on the machine I created the files in, but not in any machine that updated the files from github.
I scanned two files for testing, this was the output of the files * command on Ubuntu:

20181123004251_test.sql: ASCII text, with CRLF line terminators
20181124185152_test1.sql: ASCII text

The test.sql file never ran, I forced good and bad SQL, it never created the tables or threw any errors.
The test1.sql always worked just fine.

Both files would show up on the schema_migrations table after running dbmate up.

After changing the line endings from CRLF to LF, test.sql ran as intended.