Bring PumoPM to a working state

PumoPM successfuly runs now, displays a notification on low battery,
warning on very low battery, and suspends the computer on critical
battery level.

Cargo.lock

@@ -12,17 +12,6 @@ version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cff77d8686867eceff3105329d4698d96c2391c176d5d03adc90c7389162b5b8"
 
-[[package]]
-name = "atty"
-version = "0.2.14"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
-dependencies = [
- "hermit-abi",
- "libc",
- "winapi",
-]
-
 [[package]]
 name = "autocfg"
 version = "1.0.0"
@@ -101,7 +90,7 @@ checksum = "c74d84029116787153e02106bf53e66828452a4b325cc8652b788b5967c0a0b6"
 dependencies = [
  "num-integer",
  "num-traits",
- "time",
+ "time 0.1.43",
 ]
 
 [[package]]
@@ -110,14 +99,11 @@ version = "3.0.0-beta.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "860643c53f980f0d38a5e25dfab6c3c93b2cb3aa1fe192643d17a293c6c41936"
 dependencies = [
- "atty",
  "bitflags 1.2.1",
  "clap_derive",
  "indexmap",
  "lazy_static",
  "os_str_bytes",
- "strsim",
- "termcolor",
  "textwrap",
  "unicode-width",
  "vec_map",
@@ -219,15 +205,6 @@ dependencies = [
  "unicode-segmentation",
 ]
 
-[[package]]
-name = "hermit-abi"
-version = "0.1.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3deed196b6e7f9e44a2ae8d94225d80302d81208b1bb673fd21fe634645c85a9"
-dependencies = [
- "libc",
-]
-
 [[package]]
 name = "indexmap"
 version = "1.5.1"
@@ -405,6 +382,12 @@ dependencies = [
  "version_check",
 ]
 
+[[package]]
+name = "proc-macro-hack"
+version = "0.5.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "99c605b9a0adc77b7211c6b1f722dcb613d68d66859a44f3d485a6da332b0598"
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.19"
@@ -421,6 +404,7 @@ dependencies = [
  "battery",
  "clap",
  "notify-rust",
+ "time 0.2.16",
 ]
 
 [[package]]
@@ -468,10 +452,13 @@ dependencies = [
 ]
 
 [[package]]
-name = "strsim"
-version = "0.10.0"
+name = "standback"
+version = "0.2.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
+checksum = "b0437cfb83762844799a60e1e3b489d5ceb6a650fbacb86437badc1b6d87b246"
+dependencies = [
+ "version_check",
+]
 
 [[package]]
 name = "strum"
@@ -531,15 +518,6 @@ dependencies = [
  "unicode-xid 0.0.4",
 ]
 
-[[package]]
-name = "termcolor"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bb6bfa289a4d7c5766392812c0a1f4c1ba45afa1ad47803c11e1f407d846d75f"
-dependencies = [
- "winapi-util",
-]
-
 [[package]]
 name = "textwrap"
 version = "0.11.0"
@@ -559,6 +537,41 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "time"
+version = "0.2.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3a51cadc5b1eec673a685ff7c33192ff7b7603d0b75446fb354939ee615acb15"
+dependencies = [
+ "cfg-if",
+ "standback",
+ "time-macros",
+ "version_check",
+]
+
+[[package]]
+name = "time-macros"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ae9b6e9f095bc105e183e3cd493d72579be3181ad4004fceb01adbe9eecab2d"
+dependencies = [
+ "proc-macro-hack",
+ "time-macros-impl",
+]
+
+[[package]]
+name = "time-macros-impl"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e5c3be1edfad6027c69f5491cf4cb310d1a71ecd6af742788c6ff8bced86b8fa"
+dependencies = [
+ "proc-macro-hack",
+ "proc-macro2",
+ "quote 1.0.7",
+ "standback",
+ "syn 1.0.38",
+]
+
 [[package]]
 name = "typenum"
 version = "1.12.0"
@@ -639,15 +652,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 
-[[package]]
-name = "winapi-util"
-version = "0.1.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
-dependencies = [
- "winapi",
-]
-
 [[package]]
 name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"