Fix the rendering of some plots that failed silently

[tpoisot]

• Closes specify that users must also call using Plots #15 (mention Plots)
• Closes CompatHelper: bump compat for "RecipesBase" to "1.0" #14 (version update)
• Closes some example plots not rendering  #16 (rendering)

[codecov]

Codecov Report

Merging #17 into master will increase coverage by 0.27%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #17      +/-   ##
==========================================
+ Coverage   71.63%   71.90%   +0.27%     
==========================================
  Files           8        8              
  Lines         208      210       +2     
==========================================
+ Hits          149      151       +2     
  Misses         59       59              

Flag	Coverage Δ
#unittests	71.90% <100.00%> (+0.27%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/forcedirected.jl	86.00% <100.00%> (+0.58%)	⬆️
src/recipes.jl	82.05% <100.00%> (ø)

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[tpoisot]

The issue is in plots using Force Directed Layouts, so I need to debug these functions...