CHANGELOG - Erubi: Small ERB Implementation

Define Erubi.h as a module function (jeremyevans)
Add erubi/capture_block, supporting capturing block output via standard <%= and <%== tags (jeremyevans)

Use erb/escape for faster html escaping if available (jeremyevans)
Default :freeze_template_literals option to false if running with –enable-frozen-string-literal (casperisfine) (#35)

Support :freeze_template_literals option for configuring whether to add .freeze to template literal strings (casperisfine) (#33)
Support :chain_appends option for chaining appends to the buffer variable (casperisfine, jeremyevans) (#32)
Avoid unnecessary defined? usage on Ruby 3+ when using the :ensure option (jeremyevans)

Improve template parsing, mostly by reducing allocations (jeremyevans)
Do not ship tests in the gem, reducing gem size about 20% (jeremyevans)
Support :literal_prefix and :literal_postfix options for how to output literal tags (e.g. <%% code %>) (jaredcwhite) (#26, #27)

Change default :bufvar from 'String.new' to '::String.new' to work with BasicObject (jeremyevans)

Support :yield_returns_buffer option in capture_end for always returning the (potentially modified) buffer in <%|= tags (evanleck) (#15)

Make whitespace handling for <%# %> tags more compatible with Erubis (jeremyevans) (#14)

Fix escaping in erubi/capture_end, the setting was previously inverted (jeremyevans) (#10)

Use cgi/escape if available for 6x faster HTML escaping (k0kubun, jeremyevans) (#4)

Allow postambles to depend on internal state of engine (jeremyevans)
Allow overriding of behavior for <%= and <%== tags to depend on which indicator was used (jeremyevans)
Make whitespace handling for <% %> tags more compatible with Erubis for subclasses overriding add_text (jeremyevans)

Support :capture=>:explicit option in tilt support to use Erubi::CaptureEndEngine (jeremyevans)
Add erubi/capture_end containing Erubi::CaptureEndEngine, allowing <%|= and <%|== for opening capture tags, and <%| for closing capture tags (jeremyevans)

Don't automatically freeze template text strings on ruby 1.9 or 2.0 (jeremyevans)

Engine#src now returns a frozen string (jeremyevans)
Automatically freeze template text strings on ruby 2.1+, reducing garbage generated (jeremyevans)
Allow overriding of behavior for <%= and <%== tags (ujifgc) (#1)

Add :ensure option to supporting restoring bufvar to original value (jeremyevans)
Don't have tilt support require erb (jeremyevans)
Support :engine_class option in tilt support to override engine class used (jeremyevans)
Support :capture option in tilt support to use Erubi::CaptureEngine (jeremyevans)
Add erubi/capture file containing Erubi::CaptureEngine, allowing <%|= and <%|== for capture (and escaping) blocks in templates (jeremyevans)
Raise ArgumentError if template source code contains indicators matched by regexp but not handled (jeremyevans)
Add :bufval option to support arbitrary buffer values (jeremyevans)
Add :regexp option to specify regexp used for scanning (jeremyevans)
Add :src option to specify initial template source (jeremyevans)