Changed licenses in file headers to correct one

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (05e952b) 99.70% compared to head (f5e5637) 99.70%.

:exclamation: Current head f5e5637 differs from pull request most recent head 3bde7d5. Consider uploading reports for the commit 3bde7d5 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #35 +/- ## ======================================= Coverage 99.70% 99.70% ======================================= Files 9 9 Lines 668 668 ======================================= Hits 666 666 Misses 2 2 ``` | [Impacted Files](https://app.codecov.io/gh/rnpgp/sexp/pull/35?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=rnpgp) | Coverage Δ | | |---|---|---| | [include/sexp/ext-key-format.h](https://app.codecov.io/gh/rnpgp/sexp/pull/35?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=rnpgp#diff-aW5jbHVkZS9zZXhwL2V4dC1rZXktZm9ybWF0Lmg=) | `100.00% <ø> (ø)` | | | [include/sexp/sexp-error.h](https://app.codecov.io/gh/rnpgp/sexp/pull/35?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=rnpgp#diff-aW5jbHVkZS9zZXhwL3NleHAtZXJyb3IuaA==) | `100.00% <ø> (ø)` | | | [include/sexp/sexp.h](https://app.codecov.io/gh/rnpgp/sexp/pull/35?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=rnpgp#diff-aW5jbHVkZS9zZXhwL3NleHAuaA==) | `100.00% <ø> (ø)` | | | [src/ext-key-format.cpp](https://app.codecov.io/gh/rnpgp/sexp/pull/35?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=rnpgp#diff-c3JjL2V4dC1rZXktZm9ybWF0LmNwcA==) | `100.00% <ø> (ø)` | | | [src/sexp-error.cpp](https://app.codecov.io/gh/rnpgp/sexp/pull/35?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=rnpgp#diff-c3JjL3NleHAtZXJyb3IuY3Bw) | `100.00% <ø> (ø)` | | | [src/sexp-input.cpp](https://app.codecov.io/gh/rnpgp/sexp/pull/35?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=rnpgp#diff-c3JjL3NleHAtaW5wdXQuY3Bw) | `100.00% <ø> (ø)` | | | [src/sexp-object.cpp](https://app.codecov.io/gh/rnpgp/sexp/pull/35?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=rnpgp#diff-c3JjL3NleHAtb2JqZWN0LmNwcA==) | `98.55% <ø> (ø)` | | | [src/sexp-output.cpp](https://app.codecov.io/gh/rnpgp/sexp/pull/35?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=rnpgp#diff-c3JjL3NleHAtb3V0cHV0LmNwcA==) | `100.00% <ø> (ø)` | | | [src/sexp-simple-string.cpp](https://app.codecov.io/gh/rnpgp/sexp/pull/35?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=rnpgp#diff-c3JjL3NleHAtc2ltcGxlLXN0cmluZy5jcHA=) | `98.61% <ø> (ø)` | |

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[ronaldtse]

@maxirmx please merge when ready. Thanks!