Enable ESLint rule on limiting maxiumum length of line (max-len)

I moved the rule from legacy.js to style.js and enabled it

packages/eslint-config-airbnb/rules/legacy.js

@@ -2,8 +2,6 @@ module.exports = {
   'rules': {
     // specify the maximum depth that blocks can be nested
     'max-depth': [0, 4],
-    // specify the maximum length of a line in your program
-    'max-len': [0, 80, 4],
     // limits the number of parameters that can be used in the function declaration.
     'max-params': [0, 3],
     // specify the maximum number of statement allowed in a function

packages/eslint-config-airbnb/rules/style.js

@@ -34,6 +34,8 @@ module.exports = {
     'lines-around-comment': 0,
     // disallow mixed 'LF' and 'CRLF' as linebreaks
     'linebreak-style': 0,
+    // specify the maximum length of a line in your program
+    "max-len": [2, 100, 4],
     // specify the maximum depth callbacks can be nested
     'max-nested-callbacks': 0,
     // require a capital letter for constructors