fix: remove .transfer from loops

[rymnc]

Addresses a dos vulnerability

[github-actions[bot]]

LCOV of commit d8a9435 during CI #15

Summary coverage rate:
  lines......: 100.0% (503 of 503 lines)
  functions..: 100.0% (10 of 10 functions)
  branches...: 100.0% (26 of 26 branches)

Files changed coverage rate:
                              |Lines       |Functions  |Branches    
  Filename                    |Rate     Num|Rate    Num|Rate     Num
  ==================================================================
  contracts/Rln.sol           | 100%     42| 100%     8| 100%     26