What's new

• Add upstream bpf compatibility note (#309) by @febo
• Use sol_get_sysvar for sysvars (#296) by @febo
• Refactor Rentsysvar (#294) by @febo
• Use forward allocation (#301) by @febo
• Improve IntrospectedInstruction (#295) by @deanmlittle
• Small tweaks to documentation (#291) by @febo
• Remove deprecated code (#292) by @febo
• Use target_arch bpf (#288) by @febo
• Update crate details (#265) by @febo
• Remove crate (#264) by @febo
• Replace std for alloc (#263) by @febo
• Use solana-define-syscall crate (#262) by @febo
• Remove log module (#261) by @febo
• Remove memory module (#123) by @febo
• Use InstructionView from Solana SDK (#122) by @febo
• Use AccountView from Solana SDK (#119) by @febo
• Use Address from Solana SDK (#118) by @febo
• Use ProgramError from Solana SDK (#112) by @febo
• Bump toolchain version (#250) by @febo
• Update precision logic (#252) by @febo
• Doc typo: AccountInfo::try_borrow_mut_lamports() (#257) by @Jars1987
• Add AccountInfo invariant details (#254) by @febo