Change gemspec to load version directly, update info

tty-logger.gemspec

@@ -1,15 +1,13 @@
-lib = File.expand_path("lib", __dir__)
-$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
-require "tty/logger/version"
+require_relative "lib/tty/logger/version"
 
 Gem::Specification.new do |spec|
   spec.name          = "tty-logger"
   spec.version       = TTY::Logger::VERSION
   spec.authors       = ["Piotr Murach"]
-  spec.email         = ["me@piotrmurach.com"]
+  spec.email         = ["piotr@piotrmurach.com"]
   spec.summary       = %q{Readable, structured and beautiful terminal logging}
   spec.description   = %q{Readable, structured and beautiful terminal logging}
-  spec.homepage      = "https://piotrmurach.github.io/tty"
+  spec.homepage      = "https://ttytoolkit.org"
   spec.license       = "MIT"
 
   spec.metadata["allowed_push_host"] = "https://rubygems.org"
@@ -19,10 +17,10 @@ Gem::Specification.new do |spec|
   spec.metadata["homepage_uri"] = spec.homepage
   spec.metadata["source_code_uri"] = "https://github.com/piotrmurach/tty-logger"
 
-  spec.files         = Dir["lib/**/*.rb", "tty-logger.gemspec"]
-  spec.files        += Dir["README.md", "CHANGELOG.md", "LICENSE.txt"]
-  spec.executables   = []
+  spec.files         = Dir["lib/**/*"]
+  spec.extra_rdoc_files = Dir["README.md", "CHANGELOG.md", "LICENSE.txt"]
   spec.require_paths = ["lib"]
+
   spec.required_ruby_version = ">= 2.0.0"
 
   spec.add_dependency "pastel", "~> 0.7.0"