Increase name field size in packageurl.contrib.django.models.PackageURLMixin

[JonoYang]

I have a django webapp that uses packageurl.contrib.django.models.PackageURLMixin and I get the following error when I try to save a package with a very long name.

Traceback (most recent call last):
  File "/home/jono/nexb/src/dejacode/lib/python3.6/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
psycopg2.errors.StringDataRightTruncation: value too long for type character varying(100)


The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "./manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/home/jono/nexb/src/dejacode/lib/python3.6/site-packages/django/core/management/__init__.py", line 419, in execute_from_command_line
    utility.execute()
  File "/home/jono/nexb/src/dejacode/lib/python3.6/site-packages/django/core/management/__init__.py", line 413, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/jono/nexb/src/dejacode/lib/python3.6/site-packages/django/core/management/base.py", line 354, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/jono/nexb/src/dejacode/lib/python3.6/site-packages/django/core/management/base.py", line 398, in execute
    output = self.handle(*args, **options)
  File "/home/jono/nexb/src/dejacode/component_catalog/management/commands/setpurls.py", line 88, in handle
    Package.objects.filter(pk=package.pk).update(**package_url_dict)
  File "/home/jono/nexb/src/dejacode/lib/python3.6/site-packages/django/db/models/query.py", line 783, in update
    rows = query.get_compiler(self.db).execute_sql(CURSOR)
  File "/home/jono/nexb/src/dejacode/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 1559, in execute_sql
    cursor = super().execute_sql(result_type)
  File "/home/jono/nexb/src/dejacode/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 1175, in execute_sql
    cursor.execute(sql, params)
  File "/home/jono/nexb/src/dejacode/lib/python3.6/site-packages/django/db/backends/utils.py", line 98, in execute
    return super().execute(sql, params)
  File "/home/jono/nexb/src/dejacode/lib/python3.6/site-packages/django/db/backends/utils.py", line 66, in execute
    return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
  File "/home/jono/nexb/src/dejacode/lib/python3.6/site-packages/django/db/backends/utils.py", line 75, in _execute_with_wrappers
    return executor(sql, params, many, context)
  File "/home/jono/nexb/src/dejacode/lib/python3.6/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
  File "/home/jono/nexb/src/dejacode/lib/python3.6/site-packages/django/db/utils.py", line 90, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "/home/jono/nexb/src/dejacode/lib/python3.6/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
django.db.utils.DataError: value too long for type character varying(100)