README: improve installation section

INSTALLATION.md

@@ -1,6 +1,6 @@
 # Installation
 
-#### The normal way
+## The normal way
 
     $ pip3 install neovim-remote
 
@@ -21,7 +21,7 @@ This will give you the correct location:
 
     $ python3 -c 'import site; print(site.USER_BASE)'
 
-#### From repo
+## From repo
 
 If you want to test your own changes, it makes sense to put your local repo into
 _develop mode_. That way your Python environment will use the repo directly and
@@ -33,7 +33,7 @@ you don't have to reinstall the package after each change:
 
 Now, `pip3 list` will show the path to the local repo after the package version.
 
-#### From zip
+## From zip
 
 Download the [zipped
 sources](https://github.com/mhinz/neovim-remote/archive/master.zip) and install

README.md

@@ -6,8 +6,8 @@
 [![Supported Python versions](https://img.shields.io/pypi/pyversions/neovim-remote.svg)](https://pypi.python.org/pypi/neovim-remote)
 [![License](https://img.shields.io/pypi/l/neovim-remote.svg)](https://pypi.python.org/pypi/neovim-remote)
 
-- [Use case](#use-case)
 - [Installation](#installation)
+- [Use case](#use-case)
 - [Usage](#usage)
 - [Demos](#demos)
 - [FAQ](#faq)
@@ -33,6 +33,13 @@ If the targeted address does not exist, **nvr** starts a new process by running
 "nvim". You can change the command by setting `$NVR_CMD`. _(This requires
 forking, so it won't work on Windows.)_
 
+## Installation
+
+    $ pip3 install neovim-remote
+
+If you encounter any issues, e.g. permission denied errors or you can't find the
+`nvr` executable, read [INSTALLATION.md](INSTALLATION.md).
+
 ## Use case
 
 Imagine Neovim is set as your default editor: `EDITOR=nvim`.
@@ -55,10 +62,6 @@ create a new nvim process. In a terminal buffer, nvr will open a new buffer.
 
     $ git config --global core.editor 'nvr --remote-wait-silent'
 
-## Installation
-
-See [INSTALLATION.md](INSTALLATION.md)
-
 ## Usage
 
 Start a nvim process (which acts as a server) in one shell: