Ensure options are always an object

[danez]

Fixes #412

[codecov]

Codecov Report

Merging #413 into 7.0 will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##              7.0     #413   +/-   ##
=======================================
  Coverage   82.84%   82.84%           
=======================================
  Files           6        6           
  Lines         169      169           
  Branches       39       40    +1     
=======================================
  Hits          140      140           
  Misses         12       12           
  Partials       17       17

Impacted Files	Coverage Δ
src/index.js	84.81% <100%> (ø)	✅

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