Change hex description and bump version

Author: praveenperera

README.md

@@ -4,7 +4,9 @@ Parse RSS feeds very quickly
 
 ## Installation
 
-The package can be installed by adding `fast_rss` to your list of dependencies in `mix.exs`:
+This package is available on [hex](https://hex.pm/packages/fast_rss).
+
+It can be installed by adding `fast_rss` to your list of dependencies in `mix.exs`:
 
 ```elixir
 def deps do

mix.exs

@@ -4,12 +4,12 @@ defmodule FastRss.MixProject do
   def project do
     [
       app: :fast_rss,
-      version: "0.1.4",
-      elixir: "~> 1.5",
+      version: "0.1.5",
+      elixir: "~> 1.8",
       build_embedded: Mix.env() == :prod,
       start_permanent: Mix.env() == :prod,
       # hex
-      description: "Fast RSS parser written in rust",
+      description: "Fast Elixir RSS feed parser, a NIF wrapper around the Rust RSS crate",
       package: package(),
       start_permanent: Mix.env() == :prod,
       compilers: [:rustler] ++ Mix.compilers(),