fix style

[manulera]

No description provided.

[manulera]

I have fixed only one of them so that the number of differences is the same.

To see the full list of style errors, call pycodestyle sbol2 to get a full list

sbol2/dbtl.py:59:90: E501 line too long (101 > 89 characters)
sbol2/dbtl.py:61:90: E501 line too long (111 > 89 characters)
sbol2/dbtl.py:62:90: E501 line too long (108 > 89 characters)
sbol2/dbtl.py:63:90: E501 line too long (103 > 89 characters)
sbol2/dbtl.py:64:90: E501 line too long (134 > 89 characters)
sbol2/dbtl.py:65:90: E501 line too long (125 > 89 characters)
sbol2/dbtl.py:66:90: E501 line too long (95 > 89 characters)
sbol2/dbtl.py:80:90: E501 line too long (119 > 89 characters)
sbol2/dbtl.py:81:90: E501 line too long (96 > 89 characters)
sbol2/dbtl.py:87:90: E501 line too long (123 > 89 characters)
sbol2/dbtl.py:88:90: E501 line too long (96 > 89 characters)
sbol2/dbtl.py:89:90: E501 line too long (99 > 89 characters)
sbol2/dbtl.py:91:90: E501 line too long (105 > 89 characters)
sbol2/dbtl.py:92:90: E501 line too long (115 > 89 characters)
sbol2/dbtl.py:93:90: E501 line too long (94 > 89 characters)
sbol2/dbtl.py:112:90: E501 line too long (102 > 89 characters)
sbol2/dbtl.py:114:90: E501 line too long (91 > 89 characters)
sbol2/document.py:826:90: E501 line too long (111 > 89 characters)
sbol2/sequence.py:64:90: E501 line too long (133 > 89 characters)
sbol2/sequence.py:65:90: E501 line too long (133 > 89 characters)
sbol2/sequence.py:66:90: E501 line too long (133 > 89 characters)
sbol2/sequence.py:67:90: E501 line too long (133 > 89 characters)
sbol2/sequence.py:68:90: E501 line too long (133 > 89 characters)
sbol2/validator.py:45:90: E501 line too long (119 > 89 characters)
sbol2/validator.py:61:90: E501 line too long (92 > 89 characters)
sbol2/validator.py:64:90: E501 line too long (104 > 89 characters)
sbol2/validator.py:112:90: E501 line too long (113 > 89 characters)
sbol2/validator.py:115:90: E501 line too long (96 > 89 characters)