Update eframe requirement from 0.19.0 to 0.20.1 in /serial_term

[dependabot]

Updates the requirements on eframe to permit the latest version.

Changelog

Sourced from eframe's changelog.

0.20.1 - 2022-12-11 - Fix key-repeat

Changed 🔧

• InputState: all press functions again include key repeats (like in egui 0.19) (#2429).
• Improve the look of thin white lines (#2437).

Fixed 🐛

• Fix key-repeats for TextEdit, Sliders, etc (#2429).

0.20.0 - 2022-12-08 - AccessKit, prettier text, overlapping widgets

• MSRV (Minimum Supported Rust Version) is now 1.65.0 (#2314).
• ⚠️ BREAKING: egui now expects integrations to do all color blending in gamma space (#2071).
• ⚠️ BREAKING: if you have overlapping interactive widgets, only the top widget (last added) will be interactive (#2244).

Added ⭐

• Added helper functions for animating panels that collapse/expand (#2190).
• Added Context::os/Context::set_os to query/set what operating system egui believes it is running on (#2202).
• Added Button::shortcut_text for showing keyboard shortcuts in menu buttons (#2202).
• Added egui::KeyboardShortcut for showing keyboard shortcuts in menu buttons (#2202).
• Texture loading now takes a TexureOptions with minification and magnification filters (#2224).
• Added Key::Minus and Key::Equals (#2239).
• Added egui::gui_zoom module with helpers for scaling the whole GUI of an app (#2239).
• You can now put one interactive widget on top of another, and only one will get interaction at a time (#2244).
• Added spacing.menu_margin for customizing menu spacing (#2036)
• Added possibility to enable text wrap for the selected text of egui::ComboBox (#2272)
• Added Area::constrain and Window::constrain which constrains area to the screen bounds (#2270).
• Added Area::pivot and Window::pivot which controls what part of the window to position (#2303).
• Added support for thin space.
• Added optional integration with AccessKit for implementing platform accessibility APIs (#2294).
• Added panel_fill, window_fill and window_stroke to Visuals for your theming pleasure (#2406).
• Plots:
  • Allow linking plot cursors (#1722).
  • Added Plot::auto_bounds_x/y and Plot::reset (#2029).
  • Added PlotUi::translate_bounds (#2145).
  • Added PlotUi::set_plot_bounds (#2320).
  • Added PlotUi::plot_secondary_clicked (#2318).

Changed 🔧

• Panels always have a separator line, but no stroke on other sides. Their spacing has also changed slightly (#2261).
• Tooltips are only shown when mouse pointer is still (#2263).
• Make it slightly easier to click buttons (#2304).
• egui::color has been renamed egui::ecolor (#2399).

Fixed 🐛

• ⚠️ BREAKING: Fix text being too small (#2069).
• Improve mixed CJK/Latin line-breaking (#1986).
• Improved text rendering (#2071).
• Constrain menu popups to the screen (#2191).
• Less jitter when calling Context::set_pixels_per_point (#2239).
• Fixed popups and color edit going outside the screen.

... (truncated)

Commits

• d7189d6 Release 0.20.1 - Fix key-repeat
• 4e3ae09 Improve eframe wasm32 docs
• 0a1b85f Revert key-repeat behavior (#2429)
• e7471f1 Fix drag_value.edit_string unexpected reset (#2421)
• aca3807 Fixed docs comment in web::start (#2422)
• 32606c2 Fix docs.rs build issues for eframe, egui-winit, egui_glium, egui_glow (#2420)
• 6cc43db Fixed backspace repeat with TextEdit (#2416)
• 85f615f Fix incorrect date in CHANGELOGs
• 7d91e90 Release 0.20.0 - AccessKit, prettier text, overlapping widgets
• 124ef8d Update poll-promise and unicode_names2
• Additional commits viewable in compare view

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