Incorrect features tag in test

[FrankYFTang]

There should have no spaces before that in the line.

~/tc39/test262$ find |egrep [\.]js| xargs egrep  " features:"
./test/built-ins/Promise/prototype/then/ctor-throws.js:    features: [Symbol.species]
./test/language/expressions/object/method-definition/yield-as-parameter.js:  features: [generators]
./test/language/expressions/object/method-definition/yield-as-logical-or-expression.js:  features: [generators]
./test/language/expressions/object/method-definition/generator-no-yield.js:  features: [generators]
./test/language/expressions/object/method-definition/yield-as-literal-property-name.js:  features: [generators]
./test/language/expressions/object/method-definition/yield-weak-binding.js:  features: [generators]
./test/language/expressions/object/method-definition/yield-as-generator-method-binding-identifier.js:  features: [generators]
./test/language/expressions/object/method-definition/yield-star-after-newline.js:  features: [generators]
./test/language/expressions/object/method-definition/yield-as-property-name.js:  features: [generators]
./test/language/expressions/object/method-definition/yield-as-function-expression-binding-identifier.js:  features: [generators]
./test/language/expressions/object/method-definition/yield-as-expression-with-rhs.js:  features: [generators]
./test/language/expressions/object/method-definition/yield-as-yield-operand.js:  features: [generators]
./test/language/expressions/object/method-definition/yield-as-expression-without-rhs.js:  features: [generators]
./test/language/expressions/object/method-definition/yield-newline.js:  features: [generators]
./test/language/expressions/object/method-definition/yield-star-before-newline.js:  features: [generators]
./test/language/expressions/object/method-definition/generator-return.js:  features: [generators]
./test/language/expressions/object/method-definition/yield-as-identifier-in-nested-function.js:  features: [generators]
./test/language/expressions/object/method-definition/yield-as-statement.js:  features: [generators]
./test/language/statements/class/definition/methods-gen-yield-as-expression-without-rhs.js:  features: [generators]
./test/language/statements/class/definition/methods-gen-no-yield.js:  features: [generators]
./test/language/statements/class/definition/methods-gen-yield-star-before-newline.js:  features: [generators]
./test/language/statements/class/definition/methods-gen-yield-as-property-name.js:  features: [generators]
./test/language/statements/class/definition/methods-gen-yield-as-yield-operand.js:  features: [generators]
./test/language/statements/class/definition/methods-gen-yield-star-after-newline.js:  features: [generators]
./test/language/statements/class/definition/methods-gen-yield-newline.js:  features: [generators]
./test/language/statements/class/definition/methods-gen-yield-as-generator-method-binding-identifier.js:  features: [generators]
./test/language/statements/class/definition/methods-gen-return.js:  features: [generators]
./test/language/statements/class/definition/methods-gen-yield-as-statement.js:  features: [generators]
./test/language/statements/class/definition/methods-gen-yield-weak-binding.js:  features: [generators]
./test/language/statements/class/definition/methods-gen-yield-as-expression-with-rhs.js:  features: [generators]
./test/language/statements/class/definition/methods-gen-yield-as-identifier-in-nested-function.js:  features: [generators]
./test/language/statements/class/definition/methods-gen-yield-as-parameter.js:  features: [generators]
./test/language/statements/class/definition/methods-gen-yield-as-logical-or-expression.js:  features: [generators]
./test/language/statements/class/definition/methods-gen-yield-as-function-expression-binding-identifier.js:  features: [generators]
./test/language/statements/class/definition/methods-gen-yield-as-literal-property-name.js:  features: [generators]

I think most of them are landed by @rkirsling

[ptomato]

What you say seems correct. Would you like to make a PR for this?