Removed fixed dependencies

packages/convert/CHANGELOG.md

Index: packages/convert/CHANGELOG.md
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+## 2.0.1
+
+* `PercentEncoder` no longer encodes digits. This follows the specified
+  behavior.
+
+## 2.0.0
+
+**Note**: No new APIs have been added in 2.0.0. Packages that would use 2.0.0 as
+a lower bound should use 1.0.0 instead—for example, `convert: ">=1.0.0 <3.0.0"`.
+
+* `HexDecoder`, `HexEncoder`, `PercentDecoder`, and `PercentEncoder` no longer
+  extend `ChunkedConverter`.
+
+## 1.1.1
+
+* Fix all strong-mode warnings.
+
+## 1.1.0
+
+* Add `AccumulatorSink`, `ByteAccumulatorSink`, and `StringAccumulatorSink`
+  classes for providing synchronous access to the output of chunked converters.
+
+## 1.0.1
+
+* Small improvement in percent decoder efficiency.
+
+## 1.0.0
+
+* Initial version