Update dependencies

Cargo.toml

@@ -35,16 +35,16 @@ serde = { version = "1.0", optional = true, features = ['derive'] }
 rustc-serialize = { version = "0.3", optional = true }
 
 # Optionally demangle C++ frames' symbols in backtraces.
-cpp_demangle = { default-features = false, version = "0.3.0", optional = true }
+cpp_demangle = { default-features = false, version = "0.4.0", optional = true, features = ["alloc"] }
 
 
 # Optional dependencies enabled through the `gimli-symbolize` feature, do not
 # use these features directly.
-addr2line = { version = "0.18.0", default-features = false }
+addr2line = { version = "0.19.0", default-features = false }
 miniz_oxide = { version = "0.6.0", default-features = false }
 
 [dependencies.object]
-version = "0.29.0"
+version = "0.30.0"
 default-features = false
 features = ['read_core', 'elf', 'macho', 'pe', 'unaligned', 'archive']