fix(fullReporter): Fix off-by-one display issue

[elliot-nelson]

SUMMARY

Tweak the fullReporter slightly to display the correct line and column highlighting.

TESTS

No tests included; I don't see an easy way to provide a test for a reporter given the current approach, but let me know if I'm missing something.

TEST CASE

Using this example build, here are before and after screenshots of the output...

// gulpfile.js
module.exports.default = () => {
    const ts = typescript.createProject('tsconfig.json', typescript.reporter.fullReporter());
    return gulp.src('src/ts/example.ts')
        .pipe(ts(typescript.reporter.fullReporter())).js
        .pipe(gulp.dest('dist'));
};

// src/ts/example.ts
export function example() {
    console.log(Math.squeak());
}

BEFORE SCREENSHOT

AFTER SCREENSHOT

[ivogabe]

Thanks for your PR Elliot! Sorry for the delay