Update SECURITY.md (#141)

Author: spaskalev

SECURITY.md

@@ -1,23 +1,5 @@
 # Security Policy
 
-This is a volunteer-based open source project and support for it is available entirely on volunteering basis.
-
 Please report all issues via [GitHub's issues page](https://github.com/spaskalev/buddy_alloc/issues).
 
-If you feel that your report contains confidential information you can encrypt it using the following GnuPG public key.
-
-    -----BEGIN PGP PUBLIC KEY BLOCK-----
-
-    mDMEY5YvDhYJKwYBBAHaRw8BAQdANhKYVFTW3/rdnNoAvxYTl2XEqhcn4ULwbcMg
-    5qfSsCm0ZFN0YW5pc2xhdiBQYXNrYWxldiAoR1BHIGtleSBmb3IgcmVwb3J0aW5n
-    IHNlY3VyaXR5IGlzc3VlcyBvZiBidWRkeV9hbGxvYykgPHNwYXNrYWxldkBwcm90
-    b25tYWlsLmNvbT6IkwQTFgoAOxYhBMqF74TYkR2EeV9hC4vxh9NvBn+dBQJjli8O
-    AhsDBQsJCAcCAiICBhUKCQgLAgQWAgMBAh4HAheAAAoJEIvxh9NvBn+dhzcA/2z/
-    4eHZ7iI101NfAiHoY/CF6j4BAH/omaFS9jLSesioAP9So51hXg5tJwApCfex3DTW
-    iUn3GZ56dNfvrFD2Rm97Dbg4BGOWLw4SCisGAQQBl1UBBQEBB0DHEsDY/weVZqSj
-    JtxxiAk4+3sir4NgLxh2halFJCwUZwMBCAeIeAQYFgoAIBYhBMqF74TYkR2EeV9h
-    C4vxh9NvBn+dBQJjli8OAhsMAAoJEIvxh9NvBn+dxn8A/2sHlh4JU1n6djsK0e+w
-    KgTvhjxRXlhnpOaaLVZoZQX9AQCL3RlTDBp40+T2VMm19Oqi4BExnSYcBi00OQjZ
-    suWCBQ==
-    =BPEN
-    -----END PGP PUBLIC KEY BLOCK-----
+If your report contains confidential information you can use GitHub's private reporting of a security vulnerability as documented [here](https://docs.github.com/en/code-security/security-advisories/guidance-on-reporting-and-writing-information-about-vulnerabilities/privately-reporting-a-security-vulnerability).