Make Handlebars::Context.current thread safe #46
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Handlebars::Template#call was mutating global state. When called in
multiple threads you ran the risk of overwriting the current context for
other threads while the @fn.call was executing. By moving to a thread
variable we ensure that this value remains with the thread which is
setting the value.
Also in this PR are some dependency updates including requiring a modern
ruby. All three ruby versions previously tested are no longer
maintained.
Should address #39