Set version to v0.7.7

Test branch v0.7 in travis

## JavaCall v0.7.5

[Diff since v0.7.4](JuliaInterop/JavaCall.jl@v0.7.4...v0.7.5)



**Merged pull requests:**
- JNI methods (JuliaInterop#29) (@adambrewster)
- JNI methods update (JuliaInterop#118) (@mkitti)
- Independent JNI (JuliaInterop#120) (@mkitti)
- Faster startup (JuliaInterop#121) (@PallHaraldsson)
- Create JavaRef, JavaLocalRef, and JavaGlobalRef to hold references and manage memory (JuliaInterop#124) (@mkitti)
- CompatHelper: bump compat for "DataStructures" to "0.18" (JuliaInterop#128) (@github-actions[bot])

Add WinReg version compat to 0.3.1

See github.com/JuliaInterop/JavaCall.jl/releases/tag/v0.7.3 for relea…

…se notes

Fix integer arrays

Fix Windown10 init
Better error messages on windows

fixed reduce function call (JuliaInterop#87)

Merge pull request JuliaInterop#80 from JuliaInterop/julia-1.0

Julia 1.0

Merge pull request JuliaInterop#78 from ExpandingMan/javaerrors

some slightly better error handling

Fix version handling