docs(readme): gradient percentage on the plain race lane, history wording

The full bar's default widgets color the percentage readout with the
red to green progress gradient, so the plain progressbar2 lane in the
benchmark race now wears that too instead of rendering colorless. The
stability section states the support history the way it actually ran:
non-stop since 2012, and since 2008 before that as the original
progressbar library.

Author: wolph

README.md

@@ -380,10 +380,9 @@ if __name__ == '__main__':
 The features above are the flashy half. The other half is why the
 package has survived since 2012:
 
-- Maintained since February 2012, with 111 releases on PyPI since
-  2013. The lineage goes back further: this is the continuation of the
-  original `progressbar` package, on PyPI since 2006, and it still
-  works as a drop-in replacement for it.
+- Supported non-stop since 2012, with 111 releases on PyPI, and since
+  2008 before that as the original `progressbar` library, which
+  progressbar2 still replaces drop-in.
 - 1131 tests at 100% branch coverage, enforced in CI on every commit.
 - Fully typed (PEP 561 `py.typed`), so your type checker sees the real
   signatures.

docs/_static/demos/readme-race.svg

@@ -141,6 +141,13 @@ def race_frames(results: dict[str, typing.Any]) -> list[list[str]]:
             fraction = min(1.0, t / total)
             filled = round(fraction * BAR_WIDTH)
             pct = f'{fraction * 100:3.0f}%'
+            if lane == 'progressbar2':
+                # The full bar's default widgets color the percentage
+                # readout with the red->green progress gradient
+                # (widgets.Bar's `fg=colors.gradient` default), so the
+                # plain lane wears that here too. The fill stays plain
+                # '#', which is also faithful to the default look.
+                pct = f'{_sgr(*_gradient_rgb(fraction))}{pct}{RESET}'
             suffix = f'  {total * 1000:.1f} ms' if fraction >= 1.0 else ''
             lines.append(
                 f'{RESET}{lane:<{LABEL_WIDTH}} {pct} '