Do not report CRLF sequences in Layout/TrailingWhitespace rule

spec/ameba/rule/layout/trailing_whitespace_spec.cr

@@ -8,6 +8,28 @@ module Ameba::Rule::Layout
       expect_no_issues subject, "no-whitespace"
     end
 
+    it "passes a line ends with trailing CRLF sequence" do
+      expect_no_issues subject, "no-whitespace\r\n"
+    end
+
+    it "fails if a line ends with trailing \\r character" do
+      source = expect_issue subject, <<-TEXT
+        carriage return at the end\r
+                                # ^ error: Trailing whitespace detected
+        TEXT
+
+      expect_correction source, "carriage return at the end"
+    end
+
+    it "fails if there is a line with trailing tab" do
+      source = expect_issue subject, <<-TEXT
+        tab at the end\t
+                    # ^ error: Trailing whitespace detected
+        TEXT
+
+      expect_correction source, "tab at the end"
+    end
+
     it "fails if there is a line with trailing whitespace" do
       source = expect_issue subject,
         "whitespace at the end  \n" \

src/ameba/source.cr

@@ -48,7 +48,7 @@ module Ameba
     # source = Ameba::Source.new "a = 1\nb = 2", path
     # source.lines # => ["a = 1", "b = 2"]
     # ```
-    getter lines : Array(String) { code.split('\n') }
+    getter lines : Array(String) { code.split(/\r?\n/) }
 
     # Returns AST nodes constructed by `Crystal::Parser`.
     #