remove .travis.yml completely

.openapi-generator-ignore

@@ -1,3 +1,9 @@
+# IMPORTANT: this file is generated with the option `openapiGeneratorIgnoreList` enabled
+# (--openapi-generator-ignore-list in CLI for example) so the entries below are pre-populated based
+# on the input provided by the users and this file will be overwritten every time when the option is
+# enabled (which is the exact opposite of the default behaviour to not overwrite
+# .openapi-generator-ignore if the file exists).
+
 # OpenAPI Generator Ignore
 # Generated by openapi-generator https://github.com/openapitools/openapi-generator
 
@@ -21,3 +27,7 @@
 #docs/*.md
 # Then explicitly reverse the ignore rule for a single file:
 #!docs/README.md
+
+# The following entries are pre-populated based on the input obtained via
+# the option `openapiGeneratorIgnoreList` (--openapi-generator-ignore-list in CLI for example).
+.travis.yml

.openapi-generator/FILES

@@ -1,7 +1,5 @@
 .github/workflows/maven.yml
 .gitignore
-.openapi-generator-ignore
-.travis.yml
 README.md
 api/openapi.yaml
 build.gradle