[clike mode] Support number with underscores for Kotlin 1.1.

mode/clike/clike.js

@@ -587,6 +587,7 @@ CodeMirror.defineMode("clike", function(config, parserConfig) {
     intendSwitch: false,
     indentStatements: false,
     multiLineStrings: true,
+    number: /^(?:0x[a-f\d_]+|0b[01_]+|(?:[\d_]+\.?\d*|\.\d+)(?:e[-+]?[\d_]+)?)(u|ll?|l|f)?/i,
     blockKeywords: words("catch class do else finally for if where try while enum"),
     defKeywords: words("class val var object package interface fun"),
     atoms: words("true false null this"),