Update name for gridded AHI reader

[simonrp84]

The AHI gridded PR used an incorrect reader name (ahi_gridded). This PR updates the name to ahi_l1b_gridded_bin.

[coveralls]

Coverage increased (+0.1%) to 90.466% when pulling e4ec986 on simonrp84:gridded_ahi_reader into 4b5c503 on pytroll:master.

[mraspaud]

LGTM

[codecov]

Codecov Report

Merging #1354 into master will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1354      +/-   ##
==========================================
+ Coverage   90.35%   90.46%   +0.11%     
==========================================
  Files         228      228              
  Lines       32993    33217     +224     
==========================================
+ Hits        29811    30050     +239     
+ Misses       3182     3167      -15     

Impacted Files	Coverage Δ
satpy/readers/ahi_l1b_gridded_bin.py	99.05% <ø> (ø)
...tpy/tests/reader_tests/test_ahi_l1b_gridded_bin.py	99.34% <100.00%> (ø)
satpy/scene.py	90.42% <0.00%> (-0.18%)	⬇️
satpy/readers/seviri_l1b_nc.py	43.10% <0.00%> (ø)
satpy/readers/seviri_l1b_hrit.py	92.18% <0.00%> (ø)
satpy/readers/seviri_l1b_native.py	73.94% <0.00%> (ø)
satpy/tests/reader_tests/test_utils.py	100.00% <0.00%> (ø)
satpy/tests/reader_tests/test_aapp_l1b.py	100.00% <0.00%> (ø)
satpy/tests/reader_tests/test_seviri_base.py	100.00% <0.00%> (ø)
satpy/tests/reader_tests/test_vaisala_gld360.py	100.00% <0.00%> (ø)
... and 9 more

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[zxdawn]

I suppose it's better to show the data origin (Chiba University) in the name. Otherwise, it will be confused with the official one.

[mraspaud]

@simonrp84 could you add the source as @zxdawn suggests in the reader table?

[simonrp84]

@mraspaud By 'reader table' do you mean doc/source/index.rst? If so, I'll add it there. Otherwise let me know which doc :)

[djhoese]

Yes that file. The table is at the bottom.

[simonrp84]

Ok, I've done this now!