[FIXED] Replace toml parser with tomlrb

The toml gem depends on an old version of parslet, which can cause
conflicts if license_finder is included in a Gemfile. On the other hand,
tomlrb has no extra dependencies and seems more maintained.

lib/license_finder/package_managers/dep.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require 'toml'
+require 'tomlrb'
 
 module LicenseFinder
   class Dep < PackageManager
@@ -9,7 +9,7 @@ def possible_package_paths
     end
 
     def current_packages
-      toml = TOML.load_file(detected_package_path)
+      toml = Tomlrb.load_file(detected_package_path)
       projects = toml['projects']
 
       return [] if projects.nil?

license_finder.gemspec

@@ -46,7 +46,7 @@ Gem::Specification.new do |s|
   s.add_dependency 'bundler'
   s.add_dependency 'rubyzip', '>=1', '<3'
   s.add_dependency 'thor', '~> 1.0.1'
-  s.add_dependency 'toml', '0.2.0'
+  s.add_dependency 'tomlrb', '~> 1.3.0'
   s.add_dependency 'with_env', '1.1.0'
   s.add_dependency 'xml-simple', '~> 1.1.5'
 

spec/lib/license_finder/package_managers/dep_spec.rb

@@ -33,7 +33,7 @@ module LicenseFinder
 
       context 'the package does not have any projects in its toml' do
         before do
-          allow(TOML).to receive(:load_file).and_return({})
+          allow(Tomlrb).to receive(:load_file).and_return({})
         end
 
         it 'should return an empty array' do