Throw when using withAuthUserSSR without signed cookies

[kmjennison]

Closes #195

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[codecov]

Codecov Report

Merging #391 (6f1cfbd) into v1.x (c65ee99) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             v1.x     #391   +/-   ##
=======================================
  Coverage   99.27%   99.27%           
=======================================
  Files          25       25           
  Lines         551      553    +2     
  Branches      202      203    +1     
=======================================
+ Hits          547      549    +2     
  Misses          4        4           

Impacted Files	Coverage Δ
src/withAuthUserTokenSSR.js	100.00% <100.00%> (ø)

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