remove go.mod file cenkalti#76

add /v3 to module path

add module definition; fix cenkalti#75

reuse timer in Retry func

honor context deadlines, fix cenkalti#53 (cenkalti#64)

rename WithMaxTries to WithMaxRetries; fix cenkalti#52; fix cenkalti#54

backoff/tries.go: fix typo: missing 'o' : anther --> another

WithMaxTries creates a wrapper around another BackOff, which will
return Stop if NextBackOff() has been called too many times since
the last time Reset() was called

Note: Implementation is not thread-safe.

Signed-off-by: Michael Ira Krufky <mkrufky@gmail.com>

fix cenkalti#18: invalid randomization factor