Disable default-features for git2

The git2 default-features all have to do with ssh or ssh-keys. Those
require OpenSSL, which seems to be a bit tricky to get to compile
properly when cross-compiling on CI.

Also, since this project does not need those parts of the git2
dependency, we should be able to safely disable those features.

Co-authored-by: Maria Hansson <mariahansson92@hotmail.com>

Cargo.lock

@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "ansi_term"
 version = "0.11.0"
@@ -150,8 +152,6 @@ dependencies = [
  "libc",
  "libgit2-sys",
  "log",
- "openssl-probe",
- "openssl-sys",
  "url",
 ]
 
@@ -230,26 +230,10 @@ checksum = "bcd07968649bcb7b9351ecfde53ca4d27673cccfdf57c84255ec18710f3153e0"
 dependencies = [
  "cc",
  "libc",
- "libssh2-sys",
  "libz-sys",
- "openssl-sys",
  "pkg-config",
 ]
 
-[[package]]
-name = "libssh2-sys"
-version = "0.2.17"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d45f516b9b19ea6c940b9f36d36734062a153a2b4cc9ef31d82c54bb9780f525"
-dependencies = [
- "cc",
- "libc",
- "libz-sys",
- "openssl-sys",
- "pkg-config",
- "vcpkg",
-]
-
 [[package]]
 name = "libz-sys"
 version = "1.0.25"
@@ -277,25 +261,6 @@ version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7ffc5c5338469d4d3ea17d269fa8ea3512ad247247c30bd2df69e68309ed0a08"
 
-[[package]]
-name = "openssl-probe"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "77af24da69f9d9341038eba93a073b1fdaaa1b788221b00a69bce9e762cb32de"
-
-[[package]]
-name = "openssl-sys"
-version = "0.9.58"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a842db4709b604f0fe5d1170ae3565899be2ad3d9cbc72dedc789ac0511f78de"
-dependencies = [
- "autocfg",
- "cc",
- "libc",
- "pkg-config",
- "vcpkg",
-]
-
 [[package]]
 name = "percent-encoding"
 version = "2.1.0"

Cargo.toml

@@ -13,7 +13,7 @@ readme = "README.md"
 
 [dependencies]
 dirs = "2.0"
-git2 = "0.13"
+git2 = { version = "0.13", default-features = false }
 serde = { version =  "1.0", features = ["derive"] }
 serde_json = "1.0"
 structopt = "0.3"