Issue 54, basic SSR without treeshaking location.state and location.actions

[jcperez-ch]

Add a simple check for undefined to the window and history objects to avoid errors when using @hyperapp/router on the server side in combination with @hyperapp/render.

Assuming the subscribe method is only used in the client side.

https://github.com/hyperapp/router/issues/54

[codecov[bot]]

Codecov Report

Merging #67 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #67   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           6      6           
  Lines          68     69    +1     
  Branches       11     12    +1     
=====================================
+ Hits           68     69    +1

Impacted Files	Coverage Δ
src/location.js	100% <100%> (ø)	:arrow_up:

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