Fix build error for Julia: 1.3

[LakshyaKhatri]

This PR will fix the current build error for Julia: 1.3 and similar future build errors for lower versions too.

The error:

Warning: Deprecated syntax `"begin" inside indexing expression` at /home/travis/build/JuliaClimate/CDSAPI.jl/src/CDSAPI.jl:78.
└ @ ~/build/JuliaClimate/CDSAPI.jl/src/CDSAPI.jl:78
ERROR: LoadError: syntax: extra token "]" after end of expression

Why this error?

See: begin - end current and future scope

In other words, In our code when we wrote:

dictstr_cpy = dictstr_cpy[begin:lastcomma_pos - 1] * dictstr_cpy[lastcomma_pos + 1:end]

Julia complains, since it was expecting the syntax:

# This sub expressions must resolve to valid index or slice
array[begin <some_expression> end]

# These sub expressions must resolve to valid indices
array[begin <some_expression> end : begin <some_expression_2> end]

Solution

A quick fix is to prevent using begin and end inside arrays because of the different behaviours in different versions of Julia.

[juliohm]

You are correct, the begin syntax was only introduced in Julia v1.4. Thanks for the fix 💯