This commit updates URLs to prefer the https protocol. Redirects are not followed to avoid accidentally expanding intentionally shortened URLs (i.e. if using a URL shortener). These URLs were unable to be fixed. Please review them to see if they can be manually resolved. * http://www.prowaveconsulting.com (200) with 1 occurrences could not be migrated: ([https](https://www.prowaveconsulting.com) result SSLHandshakeException). * http://www.scispike.com (200) with 1 occurrences could not be migrated: ([https](https://www.scispike.com) result SSLHandshakeException). These URLs were switched to an https URL with a 2xx status. While the status was successful, your review is still recommended. * http://maven.apache.org/xsd/maven-4.0.0.xsd with 5 occurrences migrated to: https://maven.apache.org/xsd/maven-4.0.0.xsd ([https](https://maven.apache.org/xsd/maven-4.0.0.xsd) result 200). * http://projects.spring.io/spring-data-cassandra/ with 1 occurrences migrated to: https://projects.spring.io/spring-data-cassandra/ ([https](https://projects.spring.io/spring-data-cassandra/) result 200). * http://stackoverflow.com/questions/999489/invalid-signature-file-when-attempting-to-run-a-jar with 1 occurrences migrated to: https://stackoverflow.com/questions/999489/invalid-signature-file-when-attempting-to-run-a-jar ([https](https://stackoverflow.com/questions/999489/invalid-signature-file-when-attempting-to-run-a-jar) result 200). * http://www.pivotal.io with 2 occurrences migrated to: https://www.pivotal.io ([https](https://www.pivotal.io) result 301). These URLs were intentionally ignored. * http://maven.apache.org/POM/4.0.0 with 10 occurrences * http://www.w3.org/2001/XMLSchema-instance with 5 occurrences Resolves gh-147.