Introduce ParserError exception class

lib/github_changelog_generator/parser_file.rb

@@ -1,4 +1,6 @@
 module GitHubChangelogGenerator
+  ParserError = Class.new(StandardError)
+
   class ParserFile
     def initialize(options)
       @options = options
@@ -22,7 +24,7 @@ module GitHubChangelogGenerator
       value = false if value =~ (/^(false|f|no|n|0)$/i)
       @options[key_sym] = value
     rescue
-      raise "Config file #{file} is incorrect in line \"#{line.gsub(/[\n\r]+/, '')}\""
+      raise ParserError, "Config file #{file} is incorrect in line \"#{line.gsub(/[\n\r]+/, '')}\""
     end
 
     # Returns a the setting as a symbol and its string value sans newlines.

spec/unit/parse_file_spec.rb

@@ -20,7 +20,7 @@ describe GitHubChangelogGenerator::ParserFile do
       let(:options) { { params_file: "spec/files/github_changelog_params_incorrect" } }
       let(:options_before_change) { options.dup }
       let(:parse) { GitHubChangelogGenerator::ParserFile.new(options) }
-      it { expect { parse.parse! }.to raise_error }
+      it { expect { parse.parse! }.to raise_error(GitHubChangelogGenerator::ParserError) }
     end
 
     context "when override default values" do