Bump findshlibs to 0.7.0 (#211)

findshlibs 0.5.0 has a serious defect in `SharedLibrary::id`, where it
uses file sizes and offsets when examining the PT_NOTE sections of an
ELF binary instead of the memory size/offset fields. This issue was
corrected by gimli-rs/findshlibs@046a431, but was released along with a
couple of semver breaking changes so it needs a bump in Cargo.toml to be
picked up.

Author: bradfier

Cargo.toml

@@ -51,7 +51,7 @@ error-chain = { version = "0.12.1", optional = true }
 im = { version = "14.2.0", optional = true }
 libc = { version = "0.2.66", optional = true }
 hostname = { version = "0.3.0", optional = true }
-findshlibs = { version = "0.5.0", optional = true }
+findshlibs = { version = "0.7.0", optional = true }
 rand = { version = "0.7.3", optional = true }
 httpdate = { version = "0.3.2", optional = true }
 curl = { version = "0.4.25", optional = true }