Recommend and use 'apt install' over 'apt-get install'

Also limits the packages we recommend installing. The rest will
be installed as dependencies if needed.

Fixes issue #18.

.travis.yml

@@ -3,6 +3,6 @@ compiler:
   - gcc
   - clang
 before_install:
- - sudo apt-get update -qq
- - sudo apt-get install -qq libfuse-dev libfuse2 fuse-utils
+ - sudo apt update -qq
+ - sudo apt install -qq libfuse-dev fuse
 script: make

README.md

@@ -30,7 +30,7 @@ Or download the latest tar-ball:
 Install dependencies:
 
   - [OSXFUSE][osxfuse] on *Mac OS X*
-  - `apt get install libfuse-dev libfuse2 fuse-utils` on Debian-based *GNU/Linux* distros
+  - `sudo apt install libfuse-dev fuse` on Debian-based *GNU/Linux* distros
   - Or install the latest FUSE manually from [source][fuse]
 
 Compile: