Fix runaway italic syntax when no closing underscore

Example comment [9720796]

Author: ryanss

README.md

@@ -1,4 +1,4 @@
-vim-hackernews [![License](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/ryanss/vim-hackernews/raw/master/LICENSE) [![Version](https://img.shields.io/badge/version-0.2-orange.svg)](https://github.com/ryanss/vim-hackernews/releases/tag/v0.2) [![Build Status](https://img.shields.io/travis/ryanss/vim-hackernews.svg)](https://travis-ci.org/ryanss/vim-hackernews)
+vim-hackernews [![Build Status](https://img.shields.io/travis/ryanss/vim-hackernews.svg)](https://travis-ci.org/ryanss/vim-hackernews) [![Version](https://img.shields.io/badge/version-0.2-orange.svg)](https://github.com/ryanss/vim-hackernews/releases/tag/v0.2) [![License](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/ryanss/vim-hackernews/raw/master/LICENSE)
 ==============
 
 Browse [Hacker News](https://news.ycombinator.com) inside Vim.

doc/hackernews.txt

@@ -3,7 +3,7 @@
 Author:  ryanss <ryanssdev@icloud.com>
 Website: https://github.com/ryanss/vim-hackernews
 License: MIT (see LICENSE file)
-Version: 0.2 (April 26, 2015)
+Version: 0.3-dev
 
 
 BASIC USAGE                                     *hackernews-usage*

ftplugin/hackernews.py

@@ -7,7 +7,7 @@
 #  Author:  ryanss <ryanssdev@icloud.com>
 #  Website: https://github.com/ryanss/vim-hackernews
 #  License: MIT (see LICENSE file)
-#  Version: 0.2 (April 26, 2015)
+#  Version: 0.3-dev
 
 
 from __future__ import print_function

ftplugin/hackernews.vim

@@ -5,7 +5,7 @@
 "  Author:  ryanss <ryanssdev@icloud.com>
 "  Website: https://github.com/ryanss/vim-hackernews
 "  License: MIT (see LICENSE file)
-"  Version: 0.2 (April 26, 2015)
+"  Version: 0.3-dev
 
 
 if has('python')

plugin/hackernews.vim

@@ -5,7 +5,7 @@
 "  Author:  ryanss <ryanssdev@icloud.com>
 "  Website: https://github.com/ryanss/vim-hackernews
 "  License: MIT (see LICENSE file)
-"  Version: 0.2 (April 26, 2015)
+"  Version: 0.3-dev
 
 
 " Filetype plugins need to be enabled

syntax/hackernews.vim

@@ -5,7 +5,7 @@
 "  Author:  ryanss <ryanssdev@icloud.com>
 "  Website: https://github.com/ryanss/vim-hackernews
 "  License: MIT (see LICENSE file)
-"  Version: 0.2 (April 26, 2015)
+"  Version: 0.3-dev
 
 
 if exists("b:current_syntax")
@@ -45,8 +45,8 @@ syn match Comment /^\s*Comment\sby.\+ago:/ contains=Question
 syn region Constant start="\[http" end="\]"
 
 " Italics <i> tags
-syn match Italics /\v<_\_.{-}_>/
-highlight Italics gui=italic
+syn match Italic /\v<_\_.{-}(_>|^$)/
+highlight Italic gui=italic
 
 " Highlight code blocks
 syn region Statement start="^ " end="^ "

tests.vader

@@ -5,7 +5,7 @@
 "  Author:  ryanss <ryanssdev@icloud.com>
 "  Website: https://github.com/ryanss/vim-hackernews
 "  License: MIT (see LICENSE file)
-"  Version: 0.2 (April 26, 2015)
+"  Version: 0.3-dev
 
 Execute (Test Plugin Loaded):
   AssertEqual 1, filereadable('doc/hackernews.txt')