julia> Pkg.update()
INFO: Updating METADATA...
INFO: Updating cache of DataFrames...
INFO: Updating cache of DataFrames...
WARNING: Package TimeDomainReflectometryPeeling: skipping update (dirty)...
INFO: Updating CxxWrap master...
INFO: Computing changes...
ERROR: unsatisfiable package requirements detected: no feasible version could be found for package: ImageMagick
  (you may try increasing the value of the
   JULIA_PKGRESOLVE_ACCURACY environment variable)
 in resolve(::Dict{String,Base.Pkg.Types.VersionSet}, ::Dict{String,Dict{VersionNumber,Base.Pkg.Types.Available}}) at .\pkg\resolve.jl:37
 in resolve(::Dict{String,Base.Pkg.Types.VersionSet}, ::Dict{String,Dict{VersionNumber,Base.Pkg.Types.Available}}, ::Dict{String,Tuple{VersionNumber,Bool}}, ::Dict{String,Base.Pkg.Types.Fixed}, ::Dict{String,VersionNumber}, ::Set{String}) at .\pkg\entry.jl:495
 in update(::String, ::Set{String}) at .\pkg\entry.jl:458
 in (::Base.Pkg.Dir.##2#3{Array{Any,1},Base.Pkg.Entry.#update,Tuple{String,Set{String}}})() at .\pkg\dir.jl:31
 in cd(::Base.Pkg.Dir.##2#3{Array{Any,1},Base.Pkg.Entry.#update,Tuple{String,Set{String}}}, ::String) at .\file.jl:48 in #cd#1(::Array{Any,1}, ::Function, ::Function, ::String, ::Vararg{Any,N}) at .\pkg\dir.jl:31
 in update() at .\pkg\pkg.jl:210