Spaces arround the arrow of arrow function

[ryuran]

OK:

() => true
() => {/**/}

KO:

()=>true
()=> true
() =>true
()=>{/**/}
()=> {/**/}
() =>{/**/}
()=> {/**/}

    'arrow-spacing': ['error', {
      before: true,
      after: true
    }]

[MrChocolatine]

+1 to the proposition. Whitespace are good and not evil.