:bug: Fix #3 No support for move-only types

[krzysztof-jusiak]

Problem:

• Copyable is required by the poly constructor making it impossible to use with movable only types.

Solution:

• Relax the rules to support both copyable and movable types.

[codecov[bot]]

Codecov Report

Merging #4 into master will increase coverage by 0.31%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master       #4      +/-   ##
==========================================
+ Coverage   98.91%   99.22%   +0.31%     
==========================================
  Files          13       13              
  Lines         368      389      +21     
==========================================
+ Hits          364      386      +22     
+ Misses          4        3       -1

Impacted Files	Coverage Δ
include/te.hpp	100% <100%> (ø)	:arrow_up:
test/te.cpp	100% <100%> (+0.51%)	:arrow_up:

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