feat: log error message when dictionary file does not exist

[mammothb]

• Log error message when corpus/dictionary files is not found in create_dictionary(), load_dictionary(), and load_bigram_dictionary().

Note: chose to log error instead of raising exception to match behavior of the original project.

[codecov]

Codecov Report

Merging #109 (b0bf4e2) into master (84689da) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #109   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            8         8           
  Lines          820       825    +5     
  Branches       196       196           
=========================================
+ Hits           820       825    +5     

Impacted Files	Coverage Δ
symspellpy/symspellpy.py	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 84689da...b0bf4e2. Read the comment docs.