Changing order in example of *Functions should only be one level of abstraction*

Like said in https://github.com/ryanmcdermott/clean-code-javascript#function-callers-and-callees-should-be-close, the code is read from top to bottom, so I'd prefer the definition of the *function parseBetterJSAlternative* above the functions called within.

Author: fknipp

README.md

@@ -113,7 +113,7 @@ saveCityZipCode(city, zipCode);
 ```
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-### Avoid Mental Mapping
+### Avoid Mental Mappingf
 Explicit is better than implicit.
 
 **Bad:**
@@ -343,6 +343,14 @@ function parseBetterJSAlternative(code) {
 
 **Good:**
 ```javascript
+function parseBetterJSAlternative(code) {
+  const tokens = tokenize(code);
+  const ast = lexer(tokens);
+  ast.forEach((node) => {
+    // parse...
+  });
+}
+
 function tokenize(code) {
   const REGEXES = [
     // ...
@@ -367,14 +375,6 @@ function lexer(tokens) {
 
   return ast;
 }
-
-function parseBetterJSAlternative(code) {
-  const tokens = tokenize(code);
-  const ast = lexer(tokens);
-  ast.forEach((node) => {
-    // parse...
-  });
-}
 ```
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