typo

lib/github_changelog_generator/generator/generator_generation.rb

@@ -65,7 +65,7 @@ module GitHubChangelogGenerator
       log = ""
 
       # Generate date string:
-      time_string = newer_tag_time.strftime @options[:dateformat]
+      time_string = newer_tag_time.strftime @options[:date_format]
 
       # Generate tag name and link
       if newer_tag_name.equal? @options[:unreleased_label]

lib/github_changelog_generator/parser.rb

@@ -9,7 +9,7 @@ module GitHubChangelogGenerator
       options = {
         tag1: nil,
         tag2: nil,
-        dateformat: "%Y-%m-%d",
+        date_format: "%Y-%m-%d",
         output: "CHANGELOG.md",
         issues: true,
         add_issues_wo_labels: true,
@@ -45,7 +45,7 @@ module GitHubChangelogGenerator
           options[:token] = last
         end
         opts.on("-f", "--date-format [FORMAT]", "Date format. Default is %Y-%m-%d") do |last|
-          options[:dateformat] = last
+          options[:date_format] = last
         end
         opts.on("-o", "--output [NAME]", "Output file. Default is CHANGELOG.md") do |last|
           options[:output] = last