correct the rendermode for txt images

[johnnychen94]

If we call @test_reference "references/camera_new.txt" camera size=(5,10) it would print an "endless" string... It's definitely a bug here.

[johnnychen94]

Recent package updates break the test here; it didn't fail on my local machine until I do:

(ReferenceTests) pkg> up
  Updating registry at `~/.julia/registries/General`
  Updating git-repo `https://gitlab.lflab.cn/julialang/JuliaRegistries/General.git`
 Resolving package versions...
  Updating `~/Documents/Julia/ReferenceTests.jl/Project.toml`
  [5789e2e9] ↑ FileIO v1.0.7 ⇒ v1.2.1
  [a09fc81d] ↑ ImageCore v0.8.5 ⇒ v0.8.10
  [d8c32880] ↑ ImageInTerminal v0.4.0 ⇒ v0.4.2

CI on the latest commit also failed after I retriggered it.

The test I add here actually passes:

Reference file for "camera_new.txt" does not exist.
- NEW CONTENT -----------------
eltype: Gray{Normed{UInt8,8}}
size: (512, 512)
thumbnail:
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Update: the cause is narrowed down to FixedPointNumbers v0.7.0, but I need more time to find a solution.

[coveralls]

Coverage increased (+0.8%) to 83.077% when pulling 485f02a on johnnychen94:jc/render into eb93dfc on Evizero:master.

[coveralls]

Coverage increased (+0.8%) to 83.077% when pulling 485f02a on johnnychen94:jc/render into eb93dfc on Evizero:master.