Add missing dev_dependency on term_glyph (#153)

diff --git a/pubspec.yaml b/pubspec.yaml
index a71911b..e224b0a 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -13,4 +13,5 @@
 dev_dependencies:
   path: ^1.8.0
   pedantic: ^1.10.0
+  term_glyph: ^1.2.0
   test: ^1.16.0