Fix indentation check for classes where invocation is mistaken for a parameter list

[dguo-coursera]

Currently, the regex considers a class to start a parameter list if it contains "class", "object", or "trait" and is followed by a left-paren. However, this is incorrect in the example:
object A extends B( a, b, c)
as it is not a parameter list, but constructor/method invocation.

[codecov-io]

Current coverage is 87.14%

Merging #194 into master will not affect coverage as of 739602d

@@            master    #194   diff @@
======================================
  Files           56      56       
  Stmts         1252    1252       
  Branches       162     162       
  Methods          0       0       
======================================
  Hit           1091    1091       
  Partial          0       0       
  Missed         161     161       

Review entire Coverage Diff as of 739602d

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[matthewfarwell]

Cool. Thanks!