prepare release 0.33.0 (ruby-grape#749)

LeFnord · roger · commit be02a90333b9 · 2024-03-11T19:40:38.000+08:00
- aligns ruby versions for travis, rubocop and the gem itself
diff --git a/.travis.yml b/.travis.yml
@@ -14,7 +14,7 @@ env:
   - MODEL_PARSER=grape-swagger-entity
   - MODEL_PARSER=grape-swagger-representable
   - GRAPE_VERSION=1.0.3
-  - GRAPE_VERSION=1.2.2
+  - GRAPE_VERSION=1.2.4
   - GRAPE_VERSION=HEAD
 
 matrix:
