Use expanduser for db name

[meeuw]

Description

Use expanduser for db name, fixes #12

Checklist

• [ ] I've added this contribution to the CHANGELOG file.
• [ ] I've added my name to the AUTHORS file (or it's already there).

[codecov-io]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@e4a4aa7). Click here to learn what that means. The diff coverage is 100%.

@@            Coverage Diff            @@
##             master      #32   +/-   ##
=========================================
  Coverage          ?   67.78%           
=========================================
  Files             ?       21           
  Lines             ?     1307           
  Branches          ?        0           
=========================================
  Hits              ?      886           
  Misses            ?      421           
  Partials          ?        0

Impacted Files	Coverage Δ
litecli/sqlexecute.py	68.69% <100%> (ø)

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[amjith]

:candy: