Replacement range of text edit in completion items is too broad

[rcjsuen]

This seems to be a regression introduced by the fix for #60.

const lib = require("dockerfile-language-service");
const service = lib.DockerfileLanguageServiceFactory.createLanguageService();
const items = service.computeCompletionItems("FROM node\nMAIN", { line: 1, character: 4 });
console.log(items[0].textEdit.range);

{ start: { line: 0, character: 9 }, end: { line: 1, character: 4 } }

start should be { line: 1, character: 0 } instead.