oss: Remove Date Ranges from Copyright in READMEs
oss: Remove Date Ranges from Copyright in READMEs

Problem/Solution:

The copyright lines in the project README files,
do not need to be date ranges but can simply be
the original (first) year the code was copyrighted.

JIRA Issues: CSL-10588

Differential Revision: https://phabricator.twitter.biz/D613522

twitter/finagle,twitter/finagle,twitter/finagle,twitter/finagle,twitter/finagle