Update for bluesky v1.6.0

[danielballan]

Tested interactively on bluesky 1.6.0rc3 and 1.5.4:

In [1]: import nslsii                                                                                                                                                                         

In [2]: nslsii.configure_base(get_ipython().user_ns, 'csx');                                                                                                                                  

In [3]: RE.md                                                                                                                                                                                 
Out[3]: <PersistentDict {'versions': {}}>

In [4]: import bluesky; bluesky.__version__                                                                                                                                                   
Out[4]: '1.6.0rc3'

In [1]: import nslsii                                                                                                                                                                         

In [2]: nslsii.configure_base(get_ipython().user_ns, 'csx');                                                                                                                                  
Loading metadata history from /home/dallan/.config/bluesky/bluesky_history.db

In [3]: RE.md                                                                                                                                                                                 
Out[3]: {'scan_id': 77, 'versions': {}, 'operator': 'Tom'}

In [4]: import bluesky; bluesky.__version__                                                                                                                                                   
Out[4]: '1.5.4'

[codecov-io]

Codecov Report

Merging #75 into master will increase coverage by 0.31%. The diff coverage is 14.28%.

@@            Coverage Diff             @@
##           master      #75      +/-   ##
==========================================
+ Coverage   52.32%   52.63%   +0.31%     
==========================================
  Files          13       13              
  Lines         711      720       +9     
==========================================
+ Hits          372      379       +7     
- Misses        339      341       +2

Impacted Files	Coverage Δ
nslsii/__init__.py	6.97% <14.28%> (+1.14%)	:arrow_up:
nslsii/_version.py	44.4% <0%> (+1.8%)	:arrow_up:

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