update institutions flag name

[michaelckelly]

No description provided.

[michaelckelly]

Tests not running against the PR due to CircleCI transition, but run locally and passed:

make test
flake8 plaid
/Users/mkelly/plaid/plaid-python/venv/lib/python3.7/site-packages/pep8.py:110: FutureWarning: Possible nested set at position 1
  EXTRANEOUS_WHITESPACE_REGEX = re.compile(r'[[({] | []}),;:]')
/Users/mkelly/plaid/plaid-python/venv/lib/python3.7/site-packages/flake8/engine.py:33: PkgResourcesDeprecationWarning: Parameters to load are deprecated.  Call .resolve and .require separately.
  checker = entry.load(require=False)
./.env tox
GLOB sdist-make: /Users/mkelly/plaid/plaid-python/setup.py
py27 inst-nodeps: /Users/mkelly/plaid/plaid-python/.tox/.tmp/package/1/plaid-python-3.0.0.zip
py27 installed: DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7.,alabaster==0.7.12,Babel==2.6.0,certifi==2019.3.9,chardet==3.0.4,cov-core==1.7,coverage==3.7.1,docutils==0.14,flake8==2.4.1,idna==2.7,imagesize==1.1.0,Jinja2==2.10,MarkupSafe==1.1.1,mccabe==0.3.1,mock==1.0.1,pep8==1.7.1,plaid-python==3.0.0,py==1.4.32,pyflakes==0.8.1,Pygments==2.3.1,pytest==2.9.2,pytest-cov==1.6,pytz==2018.9,requests==2.20.0,six==1.12.0,snowballstemmer==1.2.1,Sphinx==1.5.2,urllib3==1.24.1
py27 run-test-pre: PYTHONHASHSEED='2137460422'
py27 runtests: commands[0] | coverage run --source=plaid/,tests/ -m pytest -vv --strict tests/
====================================================================== test session starts ======================================================================
platform darwin -- Python 2.7.10, pytest-2.9.2, py-1.4.32, pluggy-0.3.1 -- /Users/mkelly/plaid/plaid-python/.tox/py27/bin/python
cachedir: .cache
rootdir: /Users/mkelly/plaid/plaid-python, inifile: 
plugins: cov-1.6
collected 26 items 

tests/integration/test_accounts.py::test_get PASSED
tests/integration/test_accounts.py::test_balances_get PASSED
tests/integration/test_assets.py::test_full_flow PASSED
tests/integration/test_auth.py::test_get PASSED
tests/integration/test_categories.py::test_get PASSED
tests/integration/test_credit_details.py::test_get PASSED
tests/integration/test_identity.py::test_get PASSED
tests/integration/test_income.py::test_get PASSED
tests/integration/test_institutions.py::test_get PASSED
tests/integration/test_institutions.py::test_get_with_include_optional_metadata PASSED
tests/integration/test_institutions.py::test_get_by_id PASSED
tests/integration/test_institutions.py::test_get_by_id_with_include_optional_metadata PASSED
tests/integration/test_institutions.py::test_search PASSED
tests/integration/test_institutions.py::test_search_with_products PASSED
tests/integration/test_institutions.py::test_search_with_include_optional_metadata PASSED
tests/integration/test_item.py::test_get PASSED
tests/integration/test_item.py::test_remove PASSED
tests/integration/test_item.py::test_public_token PASSED
tests/integration/test_item.py::test_sandbox_public_token PASSED
tests/integration/test_item.py::test_access_token_invalidate PASSED
tests/integration/test_item.py::test_webhook_update PASSED
tests/integration/test_processor.py::test_stripe_processor_token PASSED
tests/integration/test_processor.py::test_dwolla_processor_token PASSED
tests/integration/test_transactions.py::test_get PASSED
tests/integration/test_transactions.py::test_get_with_options PASSED
tests/unit/test_errors.py::test_from_response PASSED

================================================================== 26 passed in 57.60 seconds ===================================================================
py27 runtests: commands[1] | coverage report -m --show-missing --fail-under 96
Name                                    Stmts   Miss  Cover   Missing
---------------------------------------------------------------------
plaid/__init__                              3      0   100%   
plaid/api/__init__                         13      0   100%   
plaid/api/accounts                         16      0   100%   
plaid/api/api                               3      0   100%   
plaid/api/assets                           26      0   100%   
plaid/api/auth                              7      0   100%   
plaid/api/categories                        4      0   100%   
plaid/api/credit_details                    4      0   100%   
plaid/api/identity                          4      0   100%   
plaid/api/income                            4      0   100%   
plaid/api/institutions                     11      0   100%   
plaid/api/item                             24      2    92%   25, 53
plaid/api/processor                         6      0   100%   
plaid/api/sandbox                          23      2    91%   13, 41
plaid/api/transactions                     11      0   100%   
plaid/client                               42      1    98%   60
plaid/errors                               32      0   100%   
plaid/requester                            29      3    90%   36, 58-59
plaid/utils                                 6      0   100%   
plaid/version                               1      0   100%   
tests/__init__                              0      0   100%   
tests/integration/__init__                  0      0   100%   
tests/integration/test_accounts            24      0   100%   
tests/integration/test_assets              59      2    97%   110, 124
tests/integration/test_auth                18      0   100%   
tests/integration/test_categories           5      0   100%   
tests/integration/test_credit_details      15      0   100%   
tests/integration/test_identity            14      0   100%   
tests/integration/test_income              17      0   100%   
tests/integration/test_institutions        38      0   100%   
tests/integration/test_item                50      3    94%   85-87
tests/integration/test_processor           13      2    85%   19, 28
tests/integration/test_transactions        36      1    97%   47
tests/integration/util                      7      0   100%   
tests/unit/__init__                         0      0   100%   
tests/unit/test_errors                     13      0   100%   
---------------------------------------------------------------------
TOTAL                                     578     16    97%