fix wrong git ignore

internal/pdf/ps/const.go

@@ -0,0 +1,15 @@
+package ps
+
+import (
+	"errors"
+)
+
+// Tolerance for comparing real values.
+const TOLERANCE = 0.000001
+
+// Common errors.
+var ErrStackUnderflow = errors.New("Stack underflow")
+var ErrStackOverflow = errors.New("Stack overflow")
+var ErrTypeCheck = errors.New("Type check error")
+var ErrRangeCheck = errors.New("Range check error")
+var ErrUndefinedResult = errors.New("Undefined result error")