Update chalk imports (TypeStrong#451)

Author: rpd10

src/_bin.ts

@@ -4,7 +4,7 @@ import { inspect } from 'util'
 import arrify = require('arrify')
 import Module = require('module')
 import minimist = require('minimist')
-import chalk = require('chalk')
+import chalk from 'chalk'
 import { diffLines } from 'diff'
 import { Script } from 'vm'
 import { register, VERSION, getFile, fileExists, TSError, parse, printError } from './index'

src/index.ts

@@ -2,7 +2,7 @@ import { relative, basename, extname, resolve, dirname, join } from 'path'
 import { writeFileSync, readFileSync, statSync } from 'fs'
 import { EOL, tmpdir, homedir } from 'os'
 import sourceMapSupport = require('source-map-support')
-import chalk = require('chalk')
+import chalk from 'chalk'
 import mkdirp = require('mkdirp')
 import crypto = require('crypto')
 import yn = require('yn')