Fix nest list issue.

* 1
    *2
* 3

Because the incorrect regexp of list element, it will parse to incorrectly nest level if item is start of a line.

Fixed in this release.

version 2.1.0

Fixed all issues. 100% complete GFM support!!

1. Fix & remove raw html rendered unnecessary
   tags.
2. Support table syntax.
3. Fix underscore regexp.
4. Fix double escape error(escape escape symbol \\).

version 2.0.1

Fix incorrect escape of code block.
For example:

handler = ->(lang, content){ content }
Minidown.render "<>", code_block_handler: handler
# Old version will output
# => "&lt;&gt;"
# it is wrong

# After fix, it will output
# => "<>"

version 2.0.0

1. API changed
   Minidown.parse(source).to_html changed to Minidown.render(source)
2. Allow user custom handler, checkout README.md
3. Allow user use Minidown::Parser, checkout README.md
   Minidown::Parser.new.render(source) is equivalent to Minidown.render(source)

version 1.0.2

Fix codeblock attribute mistake.
source

\``` ruby
hello
\```

With old version it will generated <pre lang="ruby"><code>hello</code></pre>

after fix it generated <pre><code class="ruby">hello</code></pre>

version 1.0.1

Allow tildes as well as backticks for fenced code blocks.

stable version 1.0.0

Just bump major version

version 0.0.6

fix code block, escape html tags in code block.

version 0.0.4

Fix nested ol/ul.

version 0.0.3 is first stable version!

version 0.0.3 fixed all known bugs! you should try it if you have any problem with previous