https for repo1.maven.org; Ivy 2.5.0
https for repo1.maven.org; Ivy 2.5.0

Requests to http://repo1.maven.org/maven2/ return a `501 HTTPS Required` status and a body:

    501 HTTPS Required.
    Use https://repo1.maven.org/maven2/
    More information at https://links.sonatype.com/central/501-https-required

Bumping Ivy from 2.3.0 to 2.5.0 changes http to https for dependency download.

marc4j/marc4j,Dyrcona/marc4j,marc4j/marc4j,Dyrcona/marc4j