Fix .travis.yaml syntax error

Travis was failing with the following error:

    ERROR: An error occured while trying to parse your .travis.yml file.

    Please make sure that the file is valid YAML.

    The error was "'reader' unacceptable character '' (0x94) special
    characters are not allowed in "'reader'", position 141 at line 0
    column 0".

Remove the trailing whitespace and unnecessary pipe characters in a bid
to fix this.
Merge pull request #1 from mattbostock/master

Fix .travis.yaml syntax error