GitHub uses a library called Licensee to identify a project's license
type. It shows this information in the status bar and via the API if it
can unambiguously identify the license.
This commit renames LICENSE_OF_DEPENDENCIES.md to DEPENDENCIES.md, which
allows Licensee to ignore the file when checking the repository's
license type. It also adds a "Licensing" section to the README so that
users will understand the intent of the DEPENDENCIES.md file.
Collectively, these changes allow Licensee to successfully identify the
license type of InfluxDB's codebase as MIT.
I also updated the license info for Opentracing-Go, which is now
Apache-licensed and no longer MIT-licensed.
Signed-off-by: Andrea Kao <eirinikos@gmail.com>