organize and revise unreleased changelog entries

CHANGELOG.md

 ## Unreleased
 
-* Explicitly-sized number literals with non-zero bits exceeding the given width
-  (e.g., `1'b11`, `3'sd8`, `2'o7`) are truncated and produce a warning, rather
-  than yielding a cryptic error
+### Breaking Changes
+
 * Unsized number literals exceeding the maximum width of 32 bits (e.g.,
-  `'h1_ffff_ffff`, `4294967296`) are truncated and produce a warning, rather
+  `'h1_ffff_ffff`, `4294967296`) are now truncated and produce a warning, rather
   than being silently extended
   * Support for unsized number literals exceeding the standard-imposed 32-bit
     limit can be re-enabled with `--oversized-numbers`
+* Input source files are now decoded as UTF-8 on all platforms, with transcoding
+  failures tolerated, enabling reading files encoded using other ASCII supersets
+  (e.g., Latin-1)
+
+### New Features
+
+* Added support for non-ANSI style port declarations where the port declaration
+  is separate from the corresponding net or variable declaration
+* Added support for typed value parameters declared in parameter port lists
+  without explicitly providing a leading `parameter` or `localparam` marker
+* Added support for tasks and functions with implicit port directions
+* Added support for parameters which use a type-of as the data type
+* Added support for bare delay controls with real number delays
+* Added support for deferred immediate assertions
+
+### Other Enhancements
+
+* Explicitly-sized number literals with non-zero bits exceeding the given width
+  (e.g., `1'b11`, `3'sd8`, `2'o7`) are now truncated and produce a warning,
+  rather than yielding a cryptic error
 * Number literals with leading zeroes which extend beyond the width of the
   literal (e.g., `1'b01`, `'h0_FFFF_FFFF`) now produce a warning
 * Non-positive integer size casts are now detected and forbidden
 * Negative indices in struct pattern literals are now detected and forbidden
-* Fix parsing of alternate spacings of `@(*)`
-* Tolerate escaped vendor block comments in macro bodies
-* Support deferred immediate assertion statements
-* Apply implicit port directions to tasks and functions
-* Support bare delay controls with real number delays
-* Fix parsing of sized ports with implicit directions
-* Ensure arrays used in nested ternary expressions are properly flattened
-* Support parameters which use a type-of as the data type
-* Support typed valued parameters declared in parameter port lists without
-  explicitly providing a leading `parameter` or `localparam` marker
-* Use UTF-8 on all platforms and tolerate transcoding failures, enabling reading
-  files encoding using Latin-1 with special characters in comments
-* Support for non-ANSI style port declarations where the port declaration is
-  separate from the corresponding net or variable declaration
-* Fix preprocessing of line comments which are neither preceded nor followed by
-  whitespace except for the newline which terminates the comment
-* Fix conversion of references to modports nested within types in expressions
-* Fix conversion of module-scoped references to modports
-* Fix conversion of interface-based typedefs when used with explicit modports,
+* Escaped vendor block comments in macro bodies are now tolerated
+
+### Bug Fixes
+
+* Fixed parsing of sized ports with implicit directions
+* Fixed flattening of arrays used in nested ternary expressions
+* Fixed preprocessing of line comments which are neither preceded nor followed
+  by whitespace except for the newline which terminates the comment
+* Fixed parsing of alternate spacings of `@(*)`
+* Fixed conversion of interface-based typedefs when used with explicit modports,
   unpacked arrays, or in designs with multi-dimensional instances
+* Fixed conversion of module-scoped references to modports
+* Fixed conversion of references to modports nested within types in expressions
 
 ## v0.0.8