Fix link in .travis.yml (to find source)

Author: cowtowncoder

.travis.yml

@@ -11,7 +11,7 @@ jdk:
   - oraclejdk11
 
 # Below this line is configuration for deploying to the Sonatype OSS repo
-# http://blog.xeiam.com/2013/05/configure-travis-ci-to-deploy-snapshots.html
+# https://knowm.org/configure-travis-ci-to-deploy-snapshots/
 before_install: "git clone -b travis `git config --get remote.origin.url` target/travis"
 after_success:
   - "mvn source:jar javadoc:jar deploy --settings target/travis/settings.xml"