Improve code quality and write tests

node_modules/@babel/plugin-transform-dotall-regex/test/fixtures/dotall-regex/options.json

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+{
+  "plugins": ["transform-dotall-regex"]
+}

node_modules/@babel/plugin-transform-dotall-regex/test/fixtures/dotall-regex/simple/input.js

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+var a = /./;
+var b = /./s;

node_modules/@babel/plugin-transform-dotall-regex/test/fixtures/dotall-regex/simple/output.js

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+var a = /./;
+var b = /[\0-\uFFFF]/;

node_modules/@babel/plugin-transform-dotall-regex/test/fixtures/dotall-regex/with-unicode-flag/input.js

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+var a = /./u;
+var b = /./su;

node_modules/@babel/plugin-transform-dotall-regex/test/fixtures/dotall-regex/with-unicode-flag/output.js

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+var a = /./u;
+var b = /[\0-\u{10FFFF}]/u;

node_modules/@babel/plugin-transform-dotall-regex/test/index.js

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+import runner from "@babel/helper-plugin-test-runner";
+runner(__dirname);