Requiring operators at the beginning of the line makes code more readable. When operators are on the left hand side they mirror the syntax of method chaining and it is easy to see the build of logic in a statement. This also updates the readme and fixes a style violation as a result of adding this rule in eslint-config-airbnb/test/test-base.js and eslint-config-airbnb-base/test/test-base.js.
Remove link to polish translation as it's outdated ( last commit from 2-3 years ago ).
For example in polish translation you can read that you should use one "var" keyword to declare your vars.
example:
```js
// źle ( bad )
var items = getItems();
var goSportsTeam = true;
var dragonball = 'z';
// dobrze ( good )
var items = getItems(),
goSportsTeam = true,
dragonball = 'z';
```
There were links to eslint rules in a style that didn't match the style of the rest of the document. Specifically, most links in the document use the following style: "eslint: ['no-unneeded-ternary']", but there were badly styled links that looks like this: "eslint rule: ['no-unneeded-ternary']." Additionally, the badly styled links were on their own line, whereas all the other links are not placed on their own line.
Codify existing practices for writing Markdown in style guides and
enforce them via Markdownlint. A new npm script "lint" in the top level
package.json runs before tests or as the first step of the "travis"
script.
Only modify documents in cases where they had bugs or isolated cases of
inconsistency:
README.md: 10: MD007 Unordered list indentation
Inconsistent with all other top level lists
README.md: 10: MD032 Lists should be surrounded by blank lines
Some Markdown parsers don't handle this correctly
README.md: 3156-3161: MD005 Inconsistent indentation for list items at
the same level
Bug, looks like it's intended to be another list level but GitHub
renders it at the same level as the "No but seriously"
README.md & css-in-javascript/README.md: throughout: MD012 Multiple
consecutive blank lines
README.md: throughout: MD004 Unordered list style
Some nested lists used plusses, now everything consistently uses
dashes.
