Intellij D Language plugin 1.31 released

[Danilo]

Your plugin says it supports auto-completion. It never worked for 
me using IntelliJ on macOS.

I'm following D for some month, tried several versions of the 
IntelliJ plugin over the time, but never got any useful 
auto-completion to work. No code-completion popup or anything 
most of the time.

Now i tried again using the latest version and actually got some 
code-completion for some simple codes.

For the code:
```d
   string s = String("  abcd  ");
   s.
```
I get auto-completion that makes no sense. It shows hundreds of 
entries, all starting with the letter 's', but nothing of it has 
to do with strings.
```
.safeDecode()
.scanf()
.swapEndian()
.std
.stderr
.stdin()
```
Hundreds of entries that make no sense at all...

I would like to see useful string methods/functions like .trim 
and .strip instead.

In the current state, this plugin seems pretty useless, except 
for syntax highlighting...?