Update branding in gemspec (#17)

Author: PetrHeinz

logtail.gemspec

@@ -6,12 +6,12 @@ Gem::Specification.new do |spec|
   spec.name          = "logtail"
   spec.version       = Logtail::VERSION
   spec.platform      = Gem::Platform::RUBY
-  spec.authors       = ["Logtail"]
-  spec.email         = ["hi@logtail.com"]
+  spec.authors       = ["Better Stack"]
+  spec.email         = ["hello@betterstack.com"]
   spec.homepage      = "https://github.com/logtail/logtail-ruby"
   spec.license       = "ISC"
 
-  spec.summary       = "Query logs like you query your database. https://logtail.com"
+  spec.summary       = "Query logs like you query your database. https://logs.betterstack.com/"
 
   spec.metadata["bug_tracker_uri"] = "#{spec.homepage}/issues"
   spec.metadata["changelog_uri"] = "#{spec.homepage}/tree/master/CHANGELOG.md"