Configure babel-preset-env target to modern browsers (no ie)

[blikblum]

Basically removes support to IE11 out of box (those that still need this should compile on their side)

It dramatically improves performance of generated code. Below is an example in a hot code path (as specified by the comment)

before

// this code is called in a tight loopvarcolKey=[];varrowKey=[];var_iteratorNormalCompletion3=true;var_didIteratorError3=false;var_iteratorError3=undefined;try{for(var_iterator3=Array.from(this.props.cols)[Symbol.iterator](),_step3;!(_iteratorNormalCompletion3=(_step3=_iterator3.next()).done);_iteratorNormalCompletion3=true){varx=_step3.value;colKey.push(xinrecord ? record[x] : 'null');}}catch(err){_didIteratorError3=true;_iteratorError3=err;}finally{try{if(!_iteratorNormalCompletion3&&_iterator3.return){_iterator3.return();}}finally{if(_didIteratorError3){throw_iteratorError3;}}}var_iteratorNormalCompletion4=true;var_didIteratorError4=false;var_iteratorError4=undefined;try{for(var_iterator4=Array.from(this.props.rows)[Symbol.iterator](),_step4;!(_iteratorNormalCompletion4=(_step4=_iterator4.next()).done);_iteratorNormalCompletion4=true){var_x16=_step4.value;rowKey.push(_x16inrecord ? record[_x16] : 'null');}}catch(err){_didIteratorError4=true;_iteratorError4=err;}finally{try{if(!_iteratorNormalCompletion4&&_iterator4.return){_iterator4.return();}}finally{if(_didIteratorError4){throw_iteratorError4;}}}

after

// this code is called in a tight loopconstcolKey=[];constrowKey=[];for(constxofArray.from(this.props.cols)){colKey.push(xinrecord ? record[x] : 'null');}for(constxofArray.from(this.props.rows)){rowKey.push(xinrecord ? record[x] : 'null');}