Update browser gem

`modern?` method was removed in version 4

Gemfile.lock

@@ -118,7 +118,7 @@ GEM
     bootstrap-wysihtml5-rails (0.3.3.8)
       railties (>= 3.0)
     brakeman (4.3.1)
-    browser (2.5.3)
+    browser (4.0.0)
     builder (3.2.4)
     byebug (10.0.2)
     capybara (3.29.0)

app/controllers/application_controller.rb

@@ -233,7 +233,7 @@ class ApplicationController < ActionController::Base
       key: sentry[:client_key],
       enabled: sentry[:enabled],
       environment: sentry[:environment],
-      browser: { modern: browser.modern? },
+      browser: { modern: BrowserSupport.supported?(browser) },
       user: sentry_user
     }
   end

app/helpers/application_helper.rb

@@ -131,4 +131,12 @@ module ApplicationHelper
   def has_dismissed_outdated_browser_banner?
     cookies[:dismissed_outdated_browser_banner] == 'true'
   end
+
+  def supported_browser?
+    BrowserSupport.supported?(browser)
+  end
+
+  def show_outdated_browser_banner?
+    !supported_browser? && !has_dismissed_outdated_browser_banner?
+  end
 end

app/services/browser_support.rb

@@ -0,0 +1,13 @@
+class BrowserSupport
+  def self.supported?(browser)
+    # See .browserslistrc
+    [
+      browser.chrome? && browser.version.to_i >= 50 && !browser.platform.ios?,
+      browser.edge? && browser.version.to_i >= 14 && !browser.compatibility_view?,
+      browser.firefox? && browser.version.to_i >= 50 && !browser.platform.ios?,
+      browser.opera? && browser.version.to_i >= 40,
+      browser.safari? && browser.version.to_i >= 8,
+      browser.platform.ios? && browser.platform.version.to_i >= 8
+    ].any?
+  end
+end

app/views/layouts/_outdated_browser_banner.html.haml

@@ -1,5 +1,4 @@
--# See config/browser.rb
-- if !browser.modern? && !has_dismissed_outdated_browser_banner?
+- if show_outdated_browser_banner?
   #outdated-browser-banner.site-banner
     .container
       .site-banner-icon ⚠️

config/initializers/browser.rb

@@ -1,8 +0,0 @@
-# See .browserslistrc
-Browser.modern_rules.clear
-Browser.modern_rules << -> b { b.chrome? && b.version.to_i >= 50 && !b.platform.ios? }
-Browser.modern_rules << -> b { b.edge? && b.version.to_i >= 14 && !b.compatibility_view? }
-Browser.modern_rules << -> b { b.firefox? && b.version.to_i >= 50 && !b.platform.ios? }
-Browser.modern_rules << -> b { b.opera? && b.version.to_i >= 40 }
-Browser.modern_rules << -> b { b.safari? && b.version.to_i >= 8 }
-Browser.modern_rules << -> b { b.platform.ios? && b.platform.version.to_i >= 8 }