Add a CHANGELOG file (#251)

* Add a CHANGELOG file In the same manner as the golang changelog: https://github.com/opentracing/opentracing-go/blob/master/CHANGELOG.md * incorporating feedback from comments * typo
opentracing · Feb 21, 2018 · 3e270ab · 3e270ab
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+# Changes by Version
+
+## v0.31.0 (2018-01-12) 
+* `BaseSpan` and `ActiveSpan` are simplified into a single `Span` class.
+* `Scope` replaces `ActiveSpan`, removing `Continuations`.
+* `ScopeManager` replaces `ActiveSpanSource`.
+* `Tracer.activeSpan()` returns the current value of `Tracer.scopeManager().active().span()` as a convenience.
+* `startManual()` deprecated in favor of `start()`
+* new examples directory