Remove outdated information

diff --git a/usr.sbin/rpki-client/TODO.md b/usr.sbin/rpki-client/TODO.md
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-
-The following are unclear to me.
-
-- Following up on validating AS numbers for certificates.  The
-  specification is not clear on what happens with empty AS extensions in
-  a chain of certificates.  Do we consider that inheritence?  If so,
-  what's the point of having an inheritence clause?
-
-- I get that ASid 0 has special meaning for ROAs (see RFC 6483 sec 4),
-  but it doesn't make sense that some top-level certificates (e.g.,
-  Afrinic) have a range inclusive of zero, since it's reserved.  In this
-  system, I let the range through but don't let a specific ASid of 0 in
-  certificates---only ROAs.
-
-- VRP duplication.  When run as-is, there are duplicate VRPs and
-  that doesn't seem right.  It happens when two ROAs have their validity
-  period overlap.  I need to see if there's a more programmatic way to
-  check before commiting the routes to output.
-
-- (**Important**.) Stipulating `X509_V_FLAG_IGNORE_CRITICAL` might be
-  dangerous.  Which extensions are being ignored should be
-  double-checked.