Build failure with optparse-applicative 0.13

```
Preprocessing executable 'hackmanager' for hackmanager-0.1.0.0...
[1 of 1] Compiling Main ( app/Main.hs, dist/build/hackmanager/hackmanager-tmp/Main.o )

app/Main.hs:43:34: error:
• Variable not in scope:
(<>) :: Mod f0 a0 -> Mod f1 a1 -> Mod FlagFields Bool
• Perhaps you meant one of these:
‘<$>’ (imported from Options.Applicative),
‘<*>’ (imported from Options.Applicative),
‘*>’ (imported from Options.Applicative)

app/Main.hs:54:5: error:
• Variable not in scope:
(<>)
:: Mod CommandFields (IO ()) -> Mod CommandFields (IO ()) -> t0
• Perhaps you meant one of these:
‘<$>’ (imported from Options.Applicative),
‘<*>’ (imported from Options.Applicative),
‘*>’ (imported from Options.Applicative)

app/Main.hs:55:5: error:
• Variable not in scope:
(<>)
:: t0 -> Mod CommandFields (IO ()) -> Mod CommandFields (IO ())
• Perhaps you meant one of these:
‘<$>’ (imported from Options.Applicative),
‘<*>’ (imported from Options.Applicative),
‘*>’ (imported from Options.Applicative)

app/Main.hs:61:10: error:
• Variable not in scope: (<>) :: InfoMod a2 -> InfoMod a3 -> t2
• Perhaps you meant one of these:
‘<$>’ (imported from Options.Applicative),
```