Prepare to publish for stable null safety (dart-lang/term_glyph#22)

pkgs/term_glyph/CHANGELOG.md

diff --git a/pkgs/term_glyph/CHANGELOG.md b/pkgs/term_glyph/CHANGELOG.md
index 7f8ed60..15cbaf5 100644
--- a/pkgs/term_glyph/CHANGELOG.md
+++ b/pkgs/term_glyph/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 1.2.0
+
+* Stable release for null safety.
+
 ## 1.2.0-nullsafety.3
 
 * Update SDK constraints to `>=2.12.0-0 <3.0.0` based on beta release

pkgs/term_glyph/pubspec.yaml

diff --git a/pkgs/term_glyph/pubspec.yaml b/pkgs/term_glyph/pubspec.yaml
index d989ae9..18177a3 100644
--- a/pkgs/term_glyph/pubspec.yaml
+++ b/pkgs/term_glyph/pubspec.yaml
@@ -1,5 +1,5 @@
 name: term_glyph
-version: 1.2.0-nullsafety.3
+version: 1.2.0
 
 description: Useful Unicode glyphs and ASCII substitutes.
 homepage: https://github.com/dart-lang/term_glyph