Add RAM units

[mlouielu]

No description provided.

[coveralls]

Coverage remained the same at 96.186% when pulling b8125e0 on impl_ram8 into 7930323 on master.

[codecov-io]

Codecov Report

Merging #3 into master will decrease coverage by 1.53%.
The diff coverage is 90.12%.

@@            Coverage Diff             @@
##           master       #3      +/-   ##
==========================================
- Coverage    96.4%   94.86%   -1.54%     
==========================================
  Files          17       18       +1     
  Lines         250      331      +81     
==========================================
+ Hits          241      314      +73     
- Misses          9       17       +8

Impacted Files	Coverage Δ
nand2vm/seq/__init__.py	100% <100%> (ø)	⬆️
nand2vm/seq/ram.py	90% <90%> (ø)

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[coveralls]

Coverage decreased (-1.5%) to 94.864% when pulling 02fc4b5 on impl_ram8 into 87412d3 on master.

[coveralls]

Coverage decreased (-1.5%) to 94.864% when pulling 9b1d0e4 on impl_ram8 into 87412d3 on master.