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Add CHANGELOG entry for 1.55.0 (#114)

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## 1.55.0
* **Potentially breaking bug fix:** Sass numbers are now universally stored as
64-bit floating-point numbers, rather than sometimes being stored as integers.
This will generally make arithmetic with very large numbers more reliable and
more consistent across platforms, but it does mean that numbers between nine
quadrillion and nine quintillion will no longer be represented with full
accuracy when compiling Sass on the Dart VM.
* **Potentially breaking bug fix:** Sass equality is now properly [transitive].
Two numbers are now considered equal (after doing unit conversions) if they
round to the same `1e-11`th. Previously, numbers were considered equal if they
were within `1e-11` of one another, which led to some circumstances where `$a
== $b` and `$b == $c` but `$a != $b`.
[transitive]: https://en.wikipedia.org/wiki/Transitive_property
* **Potentially breaking bug fix:** Various functions in `sass:math` no longer
treat floating-point numbers that are very close (but not identical) to
integers as integers. Instead, these functions now follow the floating-point
specification exactly. For example, `math.pow(0.000000000001, -1)` now returns
`1000000000000` instead of `Infinity`.
* Emit a deprecation warning for `$a -$b` and `$a +$b`, since these look like
they could be unary operations but they're actually parsed as binary
operations. Either explicitly write `$a - $b` or `$a (-$b)`. See
https://sass-lang.com/d/strict-unary for more details.
### Dart API
* Add an optional `argumentName` parameter to `SassScriptException()` to make it
easier to throw exceptions associated with particular argument names.
* Most APIs that previously returned `num` now return `double`. All APIs
continue to _accept_ `num`, although in Dart 2.0.0 these APIs will be changed
to accept only `double`.
### JS API
* Fix a bug in which certain warning spans would not have their properties
accessible by the JS API.
## 1.54.9
* Fix an incorrect span in certain `@media` query deprecation warnings.