master build failing several lint tests

[mattyb]

  1.  Failure: return lint report as checkstyle xml (@test-checkstyle_output.R#28) 
  2.  Failure: tab positions have been corrected (@test-get_source_expressions.R#44) 
  3.  Failure: tab positions have been corrected (@test-get_source_expressions.R#44) 
  4.  Failure: Lint all semicolons (@test-semicolon_terminator_linter.R#19) 
  5.  Failure: Lint all semicolons (@test-semicolon_terminator_linter.R#25) 
  6.  Failure: Lint all semicolons (@test-semicolon_terminator_linter.R#33) 
  7.  Failure: Lint all semicolons (@test-semicolon_terminator_linter.R#39) 
  8.  Failure: Lint all semicolons (@test-semicolon_terminator_linter.R#47) 
  9.  Failure: returns the correct linting (@test-todo_comment_linter.R#9) 
  10. Failure: returns the correct linting (@test-todo_comment_linter.R#12) 

the semicolon issues at least seem to be in cases where there are multiple expressions? Maybe related to 27ea9ca. Certainly the first issue, which is looking for something that matches the lintr version

[russHyde]

The checkstyle test seems to be failing because lintr now outputs a checkstyle file that has "1.0.3.9000" in the header, whereas the "checkstyle.xml" in the tests folder has "1.0.2.9000".

[russHyde]

Ci passes in r-3.6.1 as of #395