Error when dotted keys define values outside current table

[hukkin]

A WIP PR to adapt to spec changes made here toml-lang/toml#848

[codecov-commenter]

Codecov Report

Merging #125 (06dd6c9) into master (96dfe2c) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 06dd6c9 differs from pull request most recent head dc18e3a. Consider uploading reports for the commit dc18e3a to get more accurate results

@@            Coverage Diff            @@
##            master      #125   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          495       495           
  Branches        93        93           
=========================================
  Hits           495       495           

Impacted Files	Coverage Δ
tomli/_parser.py	100.00% <100.00%> (ø)
tomli/__init__.py	100.00% <0.00%> (ø)

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