suggestionList: change threshold to be cofficient of input length

Steal idea from TypeScript compiler:
https://github.com/microsoft/TypeScript/blob/afddaf090ad8e3a4d3501ce91490b5552d1e4a42/src/compiler/core.ts#L1752

Author: IvanGoncharov

src/jsutils/__tests__/suggestionList-test.js

@@ -52,7 +52,11 @@ describe('suggestionList', () => {
   });
 
   it('Returns options sorted based on lexical distance', () => {
-    expectSuggestions('abc', ['a', 'ab', 'abc']).to.deep.equal(['abc', 'ab']);
+    expectSuggestions('abc', ['a', 'ab', 'abc']).to.deep.equal([
+      'abc',
+      'ab',
+      'a',
+    ]);
   });
 
   it('Returns options with the same lexical distance sorted lexicographically', () => {

src/jsutils/suggestionList.js

@@ -11,9 +11,8 @@ export default function suggestionList(
   const optionsByDistance = Object.create(null);
   const lexicalDistance = new LexicalDistance(input);
 
-  const inputThreshold = input.length / 2;
+  const threshold = Math.floor(input.length * 0.4) + 1;
   for (const option of options) {
-    const threshold = Math.max(inputThreshold, option.length / 2, 1) | 0;
     const distance = lexicalDistance.measure(option, threshold);
     if (distance !== undefined) {
       optionsByDistance[option] = distance;

src/type/__tests__/enumType-test.js

@@ -178,7 +178,7 @@ describe('Type System: Enum Values', () => {
       errors: [
         {
           message:
-            'Value "green" does not exist in "Color" enum. Did you mean the enum value "GREEN"?',
+            'Value "green" does not exist in "Color" enum. Did you mean the enum value "GREEN" or "RED"?',
           locations: [{ line: 1, column: 23 }],
         },
       ],

src/validation/__tests__/ValuesOfCorrectTypeRule-test.js

@@ -923,14 +923,14 @@ describe('Validate: Values of correct type', () => {
           complicatedArgs {
             complexArgField(complexArg: {
               requiredField: true,
-              unknownField: "value"
+              invalidField: "value"
             })
           }
         }
       `).to.deep.equal([
         {
           message:
-            'Field "unknownField" is not defined by type "ComplexInput". Did you mean "booleanField", "intField", or "nonNullField"?',
+            'Field "invalidField" is not defined by type "ComplexInput". Did you mean "intField"?',
           locations: [{ line: 6, column: 15 }],
         },
       ]);