Turn off prefer-const test in eslint
Turn off prefer-const test in eslint

The semantics of const in loops are not ES2015-compatible in current versions
of Gecko.  See https://bugzilla.mozilla.org/show_bug.cgi?id=950547#c10.

l20n/l20n.js,projectfluent/fluent.js,stasm/l20n.js,zbraniecki/fluent.js,projectfluent/fluent.js,projectfluent/fluent.js,zbraniecki/l20n.js,zbraniecki/fluent.js